Question

The major product of carbylamine reaction is:

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

Hint:

Carbylamine test detects {primary amines only}. Product formed: {Isocyanide (foul smell)}.

Answer 1

The Correct Option is D

The given question is about the carbylamine reaction. Let's understand what this reaction involves and determine the major product.

The carbylamine reaction, also known as the Hofmann isocyanide test, is a chemical reaction used to test for primary amines. In this reaction, a primary amine reacts with chloroform and an alcoholic solution of potassium hydroxide to produce an isocyanide (isonitrile), which is characterized by its foul smell.

Here is the general reaction for a primary amine (RNH₂) undergoing the carbylamine reaction:

\(RNH_2 + CHCl_3 + 3KOH \rightarrow RNC + 3KCl + 3H_2O\)

In this equation:

• \(RNH_2\) is the primary amine.
• \(CHCl_3\) is chloroform.
• \(RNC\) is the resulting isocyanide (isonitrile).

The nitrogen atom from the amine and the carbon atom from chloroform form the isocyanide group \(-\text{NC}\).

Now, let's analyze the given options:

• Carboxylic acid: This is not formed in the carbylamine reaction.
• Aldehyde: This is also not involved in the carbylamine reaction.
• Cyanide: Cyanide is a different functional group, not produced in this reaction.
• Isocyanide: Correct, this is the major product of the carbylamine reaction.

Therefore, the correct answer is Isocyanide.