Question

Propane nitrile on reaction with ethyl magnesium iodide in the presence of dry ether gives complex. This imine complex on acid hydrolysis forms

• A. 2-Pentanone
• B. Butanone
• C. Propanone
• D. 3-Pentanone

Hint:

Grignard reagents react with nitriles to form imine complexes, which upon hydrolysis, yield ketones.

Answer 1

The Correct Option is D

Step 1: Understanding the reaction.
Propane nitrile reacts with ethyl magnesium iodide (a Grignard reagent) in the presence of dry ether to form an imine complex. Upon acid hydrolysis, this imine complex forms a ketone.

Step 2: Analyzing the options.
(A) 2-Pentanone: This is incorrect as it does not match the reaction outcome.
(B) Butanone: This is incorrect. The expected product is not butanone.
(C) Propanone: This is incorrect. The structure of the final product does not match propanone.
(D) 3-Pentanone: Correct — 3-Pentanone is the product formed after hydrolysis of the imine complex.

Step 3: Conclusion.
The correct answer is (D) 3-Pentanone.