JEE Main PYQs — Practical Organic Chemistry

The purification method based on the following physical transformation is :

Formation of Na4[Fe(CN)5NOS], a purple coloured complex formed by addition of sodium nitroprusside in sodium carbonate extract of salt indicates the presence of:

In Dumas' method for estimation of nitrogen, 0.5 gram of an organic compound gave 60 mL of nitrogen collected at 300 K temperature and 715 mm Hg pressure. The percentage composition of nitrogen in…

In Dumas' method for estimation of nitrogen 0.4 g of an organic compound gave 60 mL of nitrogen collected at 300 K temperature and 715 mm Hg pressure. The percentage composition of nitrogen in the…

Given below are two statements I and II. Statement I: Dumas method is used for estimation of "Nitrogen" in an organic compound. Statement II: Dumas method involves the formation of ammonium sulphate…

The technique used for purification of steam volatile water immiscible substance is:

Chromatographic technique/s based on the principle of differential adsorption is/are A. Column chromatography B. Thin layer chromatography C. Paper chromatography Choose the most appropriate answer…

Which among the following purification methods is based on the principle of "Solubility" in two different solvents?

'Adsorption' principle is used for which of the following purification method?

The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water…

The adsorbent used in adsorption chromatography is/are A. silica gel B. alumina C. quick lime D. magnesia Choose the most appropriate answer from the options given below:

Which of the following statements are correct? A. Glycerol is purified by vacuum distillation because it decomposes at its normal boiling point. B. Aniline can be purified by steam distillation as…

The correct statements among the following, for a "chromatography" purification method is:

Methods used for purification of organic compounds are based on:

Appearance of blood red colour, on treatment of the sodium fusion extract of an organic compound with FeSO4 in presence of concentrated H2SO4 indicates the presence of element/s.

The Lassiagne's extract is boiled with dil HNO3 before testing for halogens because,

In Kjeldahl's method for estimation of nitrogen, CuSO4 acts as:

Lassaigne's test is used for detection of:

Which of the following nitrogen containing compound does not give Lassaigne's test?

In qualitative test for identification of presence of phosphorous, the compound is heated with an oxidising agent. Which is further treated with nitric acid and ammonium molybdate respectively. The…

Using column chromatography, mixture of two compounds 'A' and 'B' was separated. 'A' eluted first, this indicates 'B' has

From the figure of column chromatography given below, identify incorrect statements. (A) Compound ' c ' is more polar than ' a ' and ' b ' (B) Compound ' a ' is least polar (C) Compound ' b ' comes…

Thin layer chromatography of a mixture shows the following observation: The correct order of elution in the silica gel column chromatography is

Which of the following statement is correct for paper chromatography?

In Carius tube, an organic compound ' X ' is treated with sodium peroxide to form a mineral acid ' Y '. The solution of BaCl2 is added to ' Y ' to form a precipitate ' Z '. ' Z ' is used for the…

A solution of FeCl3 when treated with K4[Fe(CN)6] gives a prussiun blue precipitate due to the formation of

Compound that will give positive Lassaigne's test for both nitrogen and halogen is

In Dumas method for the estimation of N2, the sample is heated with copper oxide and the gas evolved is passed over:

Which technique among the following is most appropriate in separation of a mixture of 100 mg of p- nitrophenol and picric acid?

Phenol on reaction with dilute nitric acid, gives two products. Which method will be most efficient for large scale separation?

Which one of the following techniques is not used to spot components of a mixture separated on thin layer chromatographic plate?

Which of the following is the structure of a separating funnel?

During halogen test, sodium fusion extract is boiled with concentrated HNO3 to

In carius method of estimation of halogen, 0.45 g of an organic compound gave 0.36 g of AgBr . Find out the percentage of bromine in the compound. (Molar masses: AgBr = 188 ~g ~mol-1, Br = 80 ~g…

Which statement is not true with respect to nitrate ion test?

The formula of the purple colour formed in Lassaigne's test for sulphur using sodium nitroprusside is

Fe3+ cation gives a Prussian blue precipitate on addition of potassium ferrocyanide solution due to the formation of:

The potassium ferrocyanide solution gives a Prussian blue colour, when added to:

Nitrogen can be estimated by Kjeldahl's method for which of the following compounds?

Which one of the following set of elements can be detected using sodium fusion extract?

Which of the following compound is added to the sodium extract before addition of silver nitrate for testing of halogens?

Which of the following is 'a' FALSE statement?

Which one of the following complexes is violet in colour?

In Carius method, halogen containing organic compound is heated with fuming nitric acid in the presence of:

Acidic ferric chloride solution on treatment with excess of potassium ferrocyanide gives a Prussian blue coloured colloidal species. It is:

A flask contains a mixture of isohexane and 3-methylpentane. One of the liquids boils at (63 C) while the other boils at (60 C). What is the best way to separate the two liquids and which one will be…

Glycerol is separated in soap industries by:

A chromatography column, packed with silica gel as stationary phase, was used to separate a mixture of compounds consisting of (A) benzanilide, (B) aniline and (C) acetophenone. When the column is…

Kjeldahl's method cannot be used to estimate nitrogen for which of the following compounds?

In Carius method of estimation of halogen, 0.172 g of an organic compound showed presence of 0.08 g of bromine. Which of these is the correct structure of the compound?

The Kjeldahl's method of nitrogen estimation fails for which of the following reaction products?