JEE Main PYQs — Aldehydes, Ketones & Carboxylic Acids
217 previous year questions from JEE Main on Aldehydes, Ketones & Carboxylic Acids. Each question shows the year, shift, full options, correct answer, and a detailed solution by Paaras Sir.
2025
29 questionsWhich compound would give 3-methyl-6-oxoheptanal upon ozonolysis?
Consider the following reactions. From these reactions which reaction will give carboxylic acid as a major product? Choose the correct answer from the options given below :
Residue (A) + HCl(dil) Compound (B) Structure of residue (A) and compound (B) formed respectively is:
Match List - I with List - II. Choose the correct answer from the options given below :
When the following compound: undergoes intramolecular aldol condensation, the major product formed is:
'P' is:
"P" is an optically active compound with molecular formula C6H12O. When "P" is treated with 2,4-dinitrophenylhydrazine, it gives a positive test. However, in presence of Tollens reagent, "P" gives a…
Mixture of 1 g each of chlorobenzene, aniline and benzoic acid is dissolved in 50 mL ethyl acetate and placed in a separating funnel. 5 M NaOH (30 mL) was added in the same funnel. The funnel was…
A toxic compound "A" when reacted with NaCN in aqueous acidic medium yields an edible cooking component and food preservative "B". "B" is converted to "C" by diborane and can be used as an additive…
Which among the following compounds give yellow solid when reacted with NaOI/NaOH?
In the light of the above statements, choose the correct answer from the options given below:
An organic compound (X) with molecular formula C3H6O is not readily oxidised. On reduction it gives C3H8O(Y) which reacts with HBr to give a bromide (Z) which is converted to Grignard reagent. This…
Aldol condensation is a popular and classical method to prepare ,-unsaturated carbonyl compounds. This reaction can be both intermolecular and intramolecular. Predict which one of the following is…
The major product (P) in the following reaction is:
Number of molecules from below which cannot give iodoform reaction is: Ethanol, Isopropyl alcohol, Bromoacetone, 2-Butanol, 2-Butanone, Butanal, 2-Pentanone, 3-Pentanone, Pentanal and 3-Pentanol
Given below are two statements: will undergo self aldol condensation very easily. In the light of the above statements, choose the most appropriate answer from the options given below:
The compounds which give positive Fehling's test are: Choose the correct answer from the options given below:
The major product of the following reaction is:
Given below are two statements: In the light of the above statements, choose the correct answer from the options given below:
Aman has been asked to synthesise the molecule (x): He thought of preparing the molecule using an aldol condensation reaction. He found a few cyclic alkenes in his laboratory. He thought of…
Both acetaldehyde and acetone (individually) undergo which of the following reactions? A. Iodoform Reaction B. Cannizzaro Reaction C. Aldol Condensation D. Tollens's Test E. Clemmensen Reduction…
A molecule ("P") on treatment with acid undergoes rearrangement and gives ("Q"). ("Q") on ozonolysis followed by reflux under alkaline condition gives ("R"). The structure of ("R") is given below.…
The product (P) formed in the following reaction is:
The total number of compounds from below when treated with hot KMnO4 giving benzoic acid is:
Given below are two statements: Statement (I): On nitration of m-xylene with HNO3, H2SO4 followed by oxidation, 4-nitrobenzene-1, 3-dicarboxylic acid is obtained as the major product. Statement (II):…
shows positive Lassaign's test for N and its molar mass is 121 gives effervescence with aq. NaHCO3 gives fruity smell. Identify A, B and C from the following.
Which of the following compounds is least likely to give effervescence of CO2 in presence of aq. NaHCO3 ?
Consider the following molecules: The correct order of rate of hydrolysis is:
The compounds that produce CO2 with aqueous NaHCO3 solution are:
2024
28 questionsThis reduction reaction is known as:
In the given reactions identify the reagent A and reagent B
Identify major product 'P' formed in the following reaction.
Identify the name reaction.
Identify A and B in the following sequence of reaction:
Identify major product "X" formed in the following reaction:
Major product of the following reaction is
Which of the following arrangements with respect to their reactivity in nucleophilic addition reaction is correct?
The final product A formed in the following multistep reaction sequence is:
Identify the reagents used for the following conversion:
m-chlorobenzaldehyde on treatment with 50% KOH solution yields:
Match List-I with List-II. Choose the correct answer from options given below :
Which among the following has highest boiling point?
Given below are two statements: Statement I: Acidity of -hydrogens of aldehydes and ketones is responsible for Aldol reaction. Statement II: Reaction between benzaldehyde and ethanal will NOT give…
Identify the product in the following reaction:
In the above chemical reaction sequence "A" and "B" respectively are:
For the compounds: The correct order of their boiling points is:
Identify 'A' in the following reaction:
Which among the following aldehydes is most reactive towards nucleophilic addition reactions?
What is the structure of C?
Which of the following compound can give positive iodoform test when treated with aqueous KOH solution followed by potassium hypoiodite.
Which of the following compounds will give silver mirror with ammoniacal silver nitrate? (A) Formic acid (B) Formaldehyde (C) Benzaldehyde (D) Acetone Choose the correct answer from the options given…
The molecular formula of second homologue in the homologous series of mono carboxylic acids is ______ .
The correct nomenclature for the following compound is:
Consider the above reaction sequence and identify the major product P.
Identify A and B in the given chemical reaction sequence:
Consider the given reaction, identify the major product P.
Identify the product (P) in the following reaction:
2023
28 questionsCompound (X) undergoes following sequence of reactions to give the Lactone (Y). Compound (X) is:
Which of the following compounds would give the following set of qualitative analysis? (i) Fehling's Test : Positive (ii) Na fusion extract upon treatment with sodium nitroprusside gives a blood red…
A is:
Given below are two statements, one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the correct answer from the options given below:
The product formed in the following multi step reaction is:
Consider the following reaction The correct statement for product B is. It is
The major product formed in the following reaction is: Choose the correct answer from the options given below:
'A' and 'B' in the below reactions are:
Given below are two statements: In the light of the above statements, choose the correct answer from the options given below:
Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R). Reason (R): Zn-Hg/HCl is used to reduce carbonyl group to -CH2- group. In the light of the…
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R): Assertion (A): Acetal/Ketal is stable in basic medium. Reason (R): The high leaving tendency…
Find out the major products from the following reaction sequence.
Find out the major product from the following reaction
Match List-I with List-II Choose the correct answer from the options given below.
The structures of major products A, B and C in the following reaction sequence.
The products formed in the above reaction are
The correct sequence of reagents for the preparation of Q and R is:
major product 'A' formed in the above reaction is
The major product 'P' for the following sequence of reactions is:
'A' in the given reaction is:
A in the above reaction is :
In the above conversion the correct sequence of reagents to be added is
Given below are two statements, one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): A solution of the product obtained by heating a mole of glycine with a mole of…
The major product formed in the following reaction is:
Match List-I with List-II. Choose the correct answer from the options given below:
The descending order of acidity for the following carboxylic acid is: (A) CH3COOH (B) F3C-COOH (C) ClCH2-COOH (D) FCH2-COOH (E) BrCH2-COOH Choose the correct answer from the options given below:
The major product 'P' formed in the following sequence of reactions is:
Boric acid is solid, whereas BF3 is gas at room temperature because of
2022
29 questionsThe correct IUPAC name of the following compound is:
Correct structure of -methylcyclohexane carbaldehyde is
Oxidation of toluene to benzaldehyde can be easily carried out with which of the following reagents?
Match List-I with List-II: Choose the correct answer from the options given below
Which of the following reactions will yield benzaldehyde as a product?
Consider the above reaction and predict the major product.
Which of the following condition or reaction sequence will NOT given acetophenone as the major product?
Given below are two statements: Statement-I: On heating with KHSO4, glycerol is dehydrated and acrolein is formed. Statement-II: Acrolein has fruity odour and can be used to test glycerol's presence.…
The structure of A in the given reaction is:
The correct structure of product 'A' formed in the following reaction is,
What is the major product of the following reaction?
The products formed in the following reaction, A and B are
Among the following marked proton of which compound shows lowest pKa value?
Which of the following is an example of conjugated diketone?
'B' is:
Which reactant will give the following alcohol on reaction with one mole of phenyl magnesium bromide (PhMgBr) followed by acidic hydrolysis?
Which will have the highest enol content?
The final product 'A' in the following reaction sequence
Isobutyraldehyde on reaction with formaldehyde and K2CO3 gives compound 'A'. Compound 'A' reacts with KCN and yields compound 'B', which on hydrolysis gives a stable compound 'C'. The compound 'C' is
The correct structure of C is
Consider the following reaction sequence: The product 'B' is
Which one of the following reactions does not represent correct combination of substrate and product under the given condition?
In the given conversion, the compound A is:
Two statements are given below: Statement-I: The melting point of monocarboxylic acid with even number of carbon atoms is higher than that of with odd number of carbon atoms acid immediately below…
The reagent, from the following, which converts benzoic acid to benzaldehyde in one step is.
Given below are two statements: Statement-I: The esterification of carboxylic acid with an alcohol is a nucleophilic acyl substitution. Statement-II: Electron withdrawing groups in the carboxylic…
Decarboxylation of all six possible forms of diaminobenzoic acids C6H3(NH2)2COOH yields three product A, B and C. Three acids give a products 'A', two acids gives a products 'B', and one acid give a…
Among the following structures, which will show the most stable enamine formation? (Where Me is -CH3)
Find out the major product for the above reaction.
2021
47 questionsThe product "P" in the above reaction is:
Consider the above reaction and identify (Y):
The major product of the following chemical reaction is:
The major product of the following reaction is: CH3CH2CH=CH2 [Rh catalyst]H2/CO
Which of the following reagent is used for the following reaction? CH3CH2CH3 ? CH3CH2CHO
B reacts with Hydroxyl amine but does not give Tollen's test. Identify A and B.
Which one of the following reactions will not form acetaldehyde?
Match List-I with List-II Choose the most appropriate match
The structure of (X) is:
The product "A" in the above reaction is:
Which one of the following compounds will provide a tertiary alcohol on reaction with excess of CH3MgBr followed by hydrolysis?
Consider the given reaction, the product 'X' is:
In the following sequence of reactions, the final product D is
Identify A in the following chemical reaction.
Assertion (A): Enol form of acetone [CH3COCH3] exists in < 0.1% quantity. However, the enol form of acetyl acetone [CH3COCH2OCCH3] exists in approximately 15% quantity. Reason (R): Enol form of…
Statement-I: Sodium hydride can be used as an oxidizing agent. Statement-II: The lone pair of electrons on nitrogen in pyridine makes it basic. Choose the CORRECT answer from the options given below:
Match List-I and List-II. Choose the correct answer from the options given below:
Which one of the following compounds will give orange precipitate when treated with 2,4-Dinitrophenyl hydrazine?
Given below are two statements: Statement-I: The nucleophilic addition of sodium hydrogen sulphite to an aldehyde or a ketone involves proton transfer to form a stable ion. Statement-II: The…
Consider the above reaction, the major product 'P' is:
For the reaction given below: The compound which is not formed as a product in the reaction is a :
An organic compound A (C6H6O) gives dark green colouration with ferric chloride. On treatment with CHCl3 and KOH, followed by acidification gives compound B. Compound B can also be obtained from…
Consider the given reaction, Identify 'X' and 'Y'
Consider the above reaction sequence, product "A" and product "B" formed respectively are:
Which one of the following is the major product of the given reaction?
Identify A in the given chemical reaction.
Consider the above reaction, the product 'X' and 'Y' respectively are:
2,4-DNP test can be used to identify :
Considering the above reaction, the major product among the following is :
Reaction of Grignard reagent, C2H5MgBr with C8H8O followed by hydrolysis gives compound "A" which reacts instantly with Lucas reagent to give compound B, C10H13Cl. The compound B is:
Which among the following above compound/s does / do not form silver mirror when treated with Tollen's reagent?
The major products formed in the following reaction sequence A and B are :
The major product (P) in the following reaction is :
Which of the following reagent is suitable for the preparation of the product in the above reaction?
A reaction of benzonitrile with one equivalent CH3MgBr followed by hydrolysis produces a yellow liquid (P). The compound (P) will give positive:
The structure of the starting compound P used in the reaction given below is:
The correct sequential addition of reagents in the preparation of 3-nitrobenzoic acid from benzene is
In the following sequence of reaction a compound A, (molecular formula C6H12O2) with a straight chain structure gives a C4 carboxylic acid. A is
Consider the above chemical reaction and identify product (A):
Maleic anhydride Maleic anhydride can be prepared by:
The structure of product C, formed by the following sequence of reactions is:
Compound(s) which will liberate carbon dioxide with sodium bicarbonate solution is/are:
The correct order of their reactivity towards hydrolysis at room temperature is:
Given below are two statements: Statement-I: Ethyl pent-4-yn-oate on reaction with CH3MgBr gives a 3-alcohol. Statement-II: In this reaction, one mole of ethyl pent-4-yn-oate utilizes two moles of…
Which one of the following compounds will liberate CO2, when treated with NaHCO3?
The correct order of acid character of the following compounds is:
Which one of the following reactions will not yield propionic acid?
2020
22 questionsThe IUPAC name of the following compound is
The major aromatic product C in the following reaction sequence will be
The correct match between List-I (starting material) and List-II (reagent) for the preparation of benzaldehyde is Choose the most appropriate answer from the options given below.
The increasing order of the following compounds towards HCN addition is
The compound A in the following reactions is:
What is the product of following reaction? Hex-3-ynal [(iv) CO2/H3O+](i) NaBH4 \\ (ii) PBr3 \\ (iii) Mg/ether Product
The major product in the following reaction is
Identify (A) in the following reaction sequence
The increasing order of the reactivity of the following compounds in nucleophilic addition reaction is: Propanal, Benzaldehyde, Propanone, Butanone
The major product [C] in the following reaction sequence will be:
The increasing order of the acidity of the -hydrogen of the following compounds is:
The IUPAC name of the following compound is:
In the following reaction sequence the major products A and B are:
The major products of the following reaction are:
Consider the following molecules and statements related to them: I. (B) is more likely to be crystalline II. (B) has higher boiling point than (A) III. (B) dissolves more readily than (A) in water…
[P] on treatment with Br2/FeBr3 in CCl4 produced a single isomer C8H7O2Br while heating [P] with sodalime gave toluene. The compound [P] is:
The most suitable reagent for the given conversion is:
An organic compound (A) (molecular formula C6H12O2) was hydrolysed with dil. H2SO4 to give a carboxylic acid (B) and an alcohol (C). 'C' gives white turbidity immediately when treated with anhydrous…
Arrange the following labelled hydrogens in decreasing order of acidity:
A solution of m-chloroaniline, m-chlorophenol and m-chlorobenzoic acid in ethyl acetate was extracted initially with a saturated solution of NaHCO3 to give fraction A. The left over organic phase was…
An organic compound [A], molecular formula C10H20O2 was hydrolyzed with dilute sulphuric acid to give a carboxylic acid [B] and an alcohol [C]. Oxidation of [C] with CrO3-H2SO4 produced [B]. Which of…
In the following reaction A is:
2019
34 questionsThe major product of the following reaction is:
The major product of the following reaction is:
The major product of the following reaction is:
The aldehydes which will not form Grignard product with one equivalent Grignard reagents are:
The major product of the following reaction is:
The major product formed in the following reaction is
The major products A and B for the following reactions are, respectively:
The major product obtained in the following reaction is
Which of the following compounds react with ethylmagnesium bromide and also decolourizes bromine water solution:
The major product of the following reaction is
Which of the following compounds will show the maximum 'enol' content?
The major product of the following reaction is
The major product of the following reaction is
Major products of the following reaction are
In the following reaction carbonyl compound + MeOH HCl Acetal rate of the reaction is the highest for:
The major product 'Y' in the following reaction is
Compound A (C9H10O) shows positive iodoform test. Oxidation of A with KMnO4/KOH gives acid B(C8H6O4). Anhydride of B is used for the preparation of phenolphthalein. Compound A is
The major product obtained in the following reaction is
In the following reaction Aldehyde + Alcohol HCl Acetal HCHO / tBuOH CH3CHO / MeOH The best combination is
The increasing order of the reactivity of the following with LiAlH4 is:
The major product 'X' formed in the following reaction is:
In the following reactions, products A and B are
The compounds A and B in the following reaction are, respectively.
p-Hydroxybenzophenone upon reaction with bromine in carbon tetrachloride gives:
The major product of the following reaction is
The decreasing order of ease of alkaline hydrolysis for the following ester is
The correct decreasing order for acidic strength is
The major product obtained in the following reaction is:
An aromatic compound 'A' having molecular formula C7H6O2 on treating with aqueous ammonia and heating forms compound 'B'. the compound 'B' on reaction with molecular bromine and potassium hydroxide…
An organic compound neither reacts with neutral ferric chloride solution nor with Fehling solution, It however, reacts with Grignard reagent and gives positive iodoform test. The compound is:
Which dicarboxylic acid in presence of a dehydrating agent is least reactive to give anhydride?
Which of the following has lowest freezing point?
The major product of the following reaction is:
The major product of the following reaction is CH3CH = CHCO2CH3 LiAlH4 Product
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