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Among the acids which have lowest pK(a) ...

Among the acids which have lowest `pK_(a)` value ?

A

`CH_(3)COOH`

B

`CH_(2)-CH_(2)-COOH`

C

`CH_(3)-underset(NO_(2))underset(|)(C)H-COOH`

D

`CH_(3)_underset(COOH)underset(|)(C)H-COOH`

Text Solution

Verified by Experts

The correct Answer is:
C
Due to presence of strong electron withdrawing group, `-NO_(2)` which increases the acidic strength and decreases the pKa value.
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