Which of the following substituents will increase the acidity of phenol?

N O_{2}

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CHO

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C H_{3}

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Solution

The correct options are
A $N O_{2}$
B CN
D CHO
Electron withdrawing groups increase the acidity of phenols.
$N O_{2}, C N$ & $C H O$ are electron withdrawing groups. They increase the acidity of phenols.

However $C H_{3}$ is electron donating group. It decreases the acidity of phenol.

Hence options A,B & C are correct.

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