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BITSAT 2014
Exam
BITSAT
Year
2014
Subject
Chemistry
Chapter
Alcohols Phenols and Ethers

BITSAT 2014 · Chemistry · Alcohols Phenols and Ethers

Consider the following phenols: The decreasing order of acidity of...

Consider the following phenols: Consider the following phenols: The decreasing order of acidity of the above phenols is
The decreasing order of acidity of the above phenols is

Options

  1. A\quad\mathrm{III}>IV>> \mathrm{IV} >\mathrm{II}>I> \mathrm{I}
  2. B\quad\mathrm{II}>>\mathrm{I}>IV>III> \mathrm{IV} > \mathrm{III}
  3. C\quad\mathrm{I}>IV>> \mathrm{IV} >\mathrm{II}>III> \mathrm{III}
  4. D\quad\mathrm{III}>IV>> \mathrm{IV} >\mathrm{I}>II> \mathrm{II}

Correct answer

A. \quad\mathrm{III}>IV>> \mathrm{IV} >\mathrm{II}>I> \mathrm{I}

Step-by-step solution

Electron withdrawing group (−NO2)\left(-\mathrm{NO}_{2}\right) increases the acidity while electron releasing group (−CH3,−H)\left(-\mathrm{CH}_{3},-\mathrm{H}\right) decreases acidity. Also effect will be more if functional group is present at para position than ortho and meta position.
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