1.

Among the aicd which have lowest pKa value .

Answer»

`CH_(3) COOH`
`CH_(3) - CH_(2) - COOH`
`CH_(3) - underset(NO_(2)) underset(|) (CH) - COOH`
`CH_(3) - underset(COOH) underset(|) (CH) - COOH`

ANSWER :C


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