Question

Which of the following amine(s) show(s) positive carbamylamine test?

• A. A and E Only
• B. C Only
• C. A and C Only
• D. B, C and D Only

Hint:

Only primary amines show a positive result in the carbamylamine test, forming isocyanides (carbamylamine).

Answer 1

The Correct Option is C

The carbamylamine test is used to detect primary amines. It results in the formation of an isocyanide (carbamylamine). 
Option A \( \text{NH}_2 \) (Phenylamine) is a primary amine and will give a positive result. 
Option B \( \text{(CH}_3)_2\text{NH} \) (Dimethylamine) is a secondary amine and does not give a positive result. 
Option C \( \text{CH}_3\text{NH}_2 \) (Methylamine) is a primary amine and will give a positive result. 
Option D \( \text{(CH}_3)_3\text{N} \) (Trimethylamine) is a tertiary amine and does not give a positive result. 
Option E \( \text{H}\text{NCH}_3 \) (Methylamine attached to a benzene ring) is a primary amine and will give a positive result. 
Thus, the correct options are A and C.