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Which of the following substituents will...

Which of the following substituents will decrease the acidic strength of phenol?

A

`-CN`

B

`-CH_(3)`

C

`-NO_(2)`

D

`-CHO`

Text Solution

Verified by Experts

The correct Answer is:
B
Electron releasing groups such as `-CH_(3)` decrease the acidic strength of phenol by destabilizing the phnoxide ion by increasing its negative charge while electron with drawing groups such as `-NO_(2), -CN, and -CHO` increase the acidic strength of phenol by stabilizing the phenoxide ion by dispersing its negative charge.
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