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JEE Advanced 2009Paper 1
Exam
JEE Advanced
Year
2009
Paper
Paper 1
Subject
Chemistry
Chapter
Carboxylic Acid Derivatives

JEE Advanced 2009 · Paper 1 · Chemistry · Carboxylic Acid Derivatives

The correct acidity order of the following is

The correct acidity order of the following is The correct acidity order of the following is

Options

  1. AIII >> IV >> II >> I
  2. BIV >> III >> I >> II
  3. CIII >> II >> I >> IV
  4. DII >> III >> IV >> I

Correct answer

A. III >> IV >> II >> I

Step-by-step solution

A carboxylic acid is stronger acid than phenol, hence both III and IV are stronger acids than both I and II. Also IV has a methyl group that gives electron donating inductive effect and decreases the acid strength. Therefore, III is stronger acid that IV. Between I and II, the dominant electron withdrawing inductive effect of chlorine increases acid strength of phenol slightly, hence II is stronger acid than I. Thus, the overall order is : (a) III >> IV >> II >> I
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