Question:
Identify the compounds which can react with chloroform and alcoholic KOH and give substances with offensive odour (Carbylamine test).
Identify the compounds which can react with chloroform and alcoholic KOH and give substances with offensive odour (Carbylamine test).
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Only primary amines ($1^\circ$) react with $CHCl_3$ and alc. KOH to produce foul-smelling isocyanides.
Updated On: Jun 10, 2026
- I, II only
- II, III only
- II, IV only
- I, III only
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The Correct Option is C
Solution and Explanation
Step 1: Concept
Carbylamine test is positive for primary amines ($R-NH_2$).
Step 2: Analysis
* N,N-Dimethyl aniline ($3^\circ$ amine): Negative. * 2,4-Dimethyl aniline ($1^\circ$ amine): Positive. * N-Methyl-o-methyl aniline ($2^\circ$ amine): Negative. * p-Methyl benzyl amine ($1^\circ$ amine): Positive.
Step 3: Conclusion
II and IV are primary amines and give a positive carbylamine test.
Final Answer: (C)
Carbylamine test is positive for primary amines ($R-NH_2$).
Step 2: Analysis
* N,N-Dimethyl aniline ($3^\circ$ amine): Negative. * 2,4-Dimethyl aniline ($1^\circ$ amine): Positive. * N-Methyl-o-methyl aniline ($2^\circ$ amine): Negative. * p-Methyl benzyl amine ($1^\circ$ amine): Positive.
Step 3: Conclusion
II and IV are primary amines and give a positive carbylamine test.
Final Answer: (C)
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