Chemistry Carboxylic Acids SZABMU 2023
PMDC Verified Question 26 of 94
Thionyl chloride reacts with acetic acid resulting in transformation of Carboxylic group to:
A
Acetamide
B
Acid halide
C
Alcohol
D
Ester
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Acid halide
Concept:

Thionyl chloride (\( \text{SOCl}_2 \)) acts as a chlorinating agent, specifically targeting the hydroxyl component of the carboxyl group.

Formula:

$$ \text{R-COOH} + \text{SOCl}_2 \longrightarrow \text{R-COCl} + \text{SO}_2\uparrow + \text{HCl}\uparrow $$

Solution:

  • The \( -\text{OH} \) group of the carboxylic acid is substituted by a halogen (chlorine).


  • This transforms the carboxylic functional group (\( -\text{COOH} \)) into an acid halide functional group (\( -\text{COCl} \)).


Why other options are incorrect:

Acetamides require reaction with ammonia. Alcohols require strong reducing agents. Esters require reaction with an alcohol.

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