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Why cyanoanilinium ion (C6H4(CN) overset...

Why cyanoanilinium ion `(C_6H_4(CN) overset (oplus) N H_3) (I)` is a stronger acid than anilinium ion `(II)` ?

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Due to `-I` and `-R` effects of `(-CN)` group, `(I)` is a stronger acid than `(II)`.
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