Question

The major product of carbylamine reaction is :

• A. Carboxylic acid
• B. Aldehyde
• C. Cyanide
• D. Isocyanide

Hint:

Carbylamine test is given only by primary amines and produces foul-smelling isocyanides \((RNC)\). Remember: \[ RNH_2 + CHCl_3 + KOH \rightarrow RNC \]

Answer 1

The Correct Option is D

Concept: The Carbylamine reaction is a characteristic test for primary amines. When a primary amine is heated with chloroform and alcoholic potassium hydroxide, a foul-smelling isocyanide is produced. The reaction is represented as \[ RNH_2 + CHCl_3 + 3KOH \rightarrow RNC + 3KCl + 3H_2O \] where \(RNC\) is an isocyanide. This reaction is used as a test for distinguishing primary amines from secondary and tertiary amines.

Step 1: Recalling the product formed in Carbylamine reaction. The reaction involves \[ \text{Primary Amine} + CHCl_3 + KOH \] and produces Isocyanide as the main product.

Step 2: Writing the general reaction. \[ RNH_2 + CHCl_3 + 3KOH \rightarrow RNC + 3KCl + 3H_2O \] The product \(RNC\) is called isocyanide or carbylamine.

Step 3: Examining the options. Carboxylic acids are not produced. Aldehydes are not produced. Cyanides \((RCN)\) are not produced. The actual product is isocyanide \((RNC)\). Therefore, Option (D) is correct. \[ \boxed{\text{Option (D)}} \]