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pK(a) increases in benzoic acid when sub...

`pK_(a)` increases in benzoic acid when substituent "x" is bonded at para - position, then "x" is-

A

`-COOH`

B

`-NO_(2)`

C

`CN

D

`-OCH_(3)`

Text Solution

Verified by Experts

The correct Answer is:
D
Larger the value of `pK_(a)`, smaller will be its acidity. Out of the four groups, -COOH, `-NO_(2) and -CN` are electron withdrawing which makes benzoic acid more acidic whereas `-OCH_(3)` is electron donating which reduces the acidity (makes `H^(+)` less easily available). `pK_(a)` value increases if `-OCH_(3)` is present at para position of benzoic acid.
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