Question

Identify the product obtained when 3, 5 - dinitrobenzoic acid is heated with thionyl chloride.

• A. 3, 5 - Dinitrobenzyl chloride
• B. 3, 5 - Dichlorobenzyl chloride
• C. 3, 5 - Dinitrobenzoyl chloride
• D. 3 - Chloro - 5 - nitrobenzoic acid

Hint:

In reactions with thionyl chloride, carboxylic acids are converted to acyl chlorides, which are useful intermediates in organic synthesis.

Answer 1

The Correct Option is C

Step 1: Understanding the reaction.
When 3, 5 - dinitrobenzoic acid is heated with thionyl chloride (SOCl2), it undergoes a reaction where the carboxyl group (-COOH) is converted into an acyl chloride group (-COCl). The product of this reaction is 3, 5 - dinitrobenzoyl chloride.
Step 2: Analyzing the options.
(A) 3, 5 - Dinitrobenzyl chloride: Incorrect. The reaction involves the conversion of the carboxyl group to an acyl chloride group, not a benzyl chloride group.
(B) 3, 5 - Dichlorobenzyl chloride: Incorrect. This does not match the expected product, as there is no dichlorination involved in the reaction.
(C) 3, 5 - Dinitrobenzoyl chloride: Correct. This is the expected product, where the carboxyl group of 3, 5 - dinitrobenzoic acid is converted to an acyl chloride group.
(D) 3 - Chloro - 5 - nitrobenzoic acid: Incorrect. This is not a product of the reaction with thionyl chloride.
Step 3: Conclusion.
The correct answer is (C) 3, 5 - Dinitrobenzoyl chloride, which is the expected product from heating 3, 5 - dinitrobenzoic acid with thionyl chloride.