Which of the following amine(s) show(s) positive carbylamines test? (A) Aniline (C6H5NH2) (B) (CH3)2NH (C) CH3NH2 (D)…
Amines · Class 12 · JEE Main Previous Year Question
Which of the following amine(s) show(s) positive carbylamines test?
(A) Aniline ()
(B)
(C)
(D)
(E) N-methylaniline ()
Choose the correct answer from the options given below:
- a
A and E Only
- b
C Only
- c✓
A and C Only
- d
B, C and D Only
A and C Only
Step 1: Recall the carbylamine (isocyanide) test
The carbylamine test is positive only for primary amines (1° amines — both aliphatic and aromatic).
Reaction: Primary amine + + alc. KOH → isocyanide (foul smell)
Step 2: Classify each amine
| Amine | Type | Test | |---|---|---| | (A) Aniline | 1° aromatic | ✓ Positive | | (B) | 2° aliphatic | ✗ Negative | | (C) | 1° aliphatic | ✓ Positive | | (D) | 3° aliphatic | ✗ Negative | | (E) | 2° aromatic | ✗ Negative |
Step 3: Conclusion
Only (A) and (C) are primary amines → Answer: (c) A and C Only
Practice this question with progress tracking
Want timed practice with adaptive difficulty? Solve this question (and hundreds more from Amines) inside The Crucible, our adaptive practice platform.
More JEE Main Amines PYQs
The sequence from the following that would result in giving predominantly 3, 4, 5-Tribromoaniline is:
The correct order of basic strength in aqueous solution for the bases NH3, H2N-NH2, CH3CH2NH2, (CH3CH2)2NH and (CH3CH2)3N is:
When a concentrated solution of sulphanilic acid and 1-naphthylamine is treated with nitrous acid (273 K) and acidified with acetic acid, the mass (g) of 0.1 mole of product formed is: (Given molar…
Total number of nucleophiles from the following is: NH3, PhSH, (H3C)2S, H2C=CH2, OH, H3O+, (CH3)2CO, NCH3 (N-methylamine with lone pair)
The steam volatile compounds among the following are: (A) 2-nitrophenol (OH and NO₂ ortho), (B) 2-nitroaniline (NH₂ and NO₂ ortho), (C) 4-aminophenol (NH₂ and OH para), (D) 4-nitroaniline (NH₂ and…