Question

Which of the following compounds is obtained on heating primary amine with chloroform and alcoholic potassium hydroxide?

• A. Alkene
• B. Alkyl cyanide
• C. Alkyl isocyanide
• D. Amide

Hint:

The reaction of primary amines with chloroform and alcoholic KOH forms alkyl isocyanides (isonitriles), which is a useful reaction in organic synthesis.

Answer 1

The Correct Option is C

Step 1: Understanding the reaction.
When a primary amine reacts with chloroform (CHCl₃) and alcoholic potassium hydroxide (KOH), an isocyanide (also known as an isothiocyanate) is formed. This is known as the isonitrile reaction. The reaction proceeds through the formation of an intermediate isocyanide group.
Step 2: Analyzing the options.
(A) Alkene: Incorrect. Alkenes are not typically formed in this reaction.
(B) Alkyl cyanide: Incorrect. Alkyl cyanides (nitriles) are not produced in this reaction.
(C) Alkyl isocyanide: Correct — Alkyl isocyanides are produced in this reaction.
(D) Amide: Incorrect. Amides are not formed in this reaction.
Step 3: Conclusion.
The correct answer is (C) Alkyl isocyanide, as this is the product of the reaction between primary amine, chloroform, and alcoholic potassium hydroxide.