Question

Give the order of acidic character, $o-,p-$, and $m$-cyanoanilinium ions.

• A. $p->o->m-$
• B. $p->m->o-$
• C. $o->p->m-$
• D. $o->m->p-$

Answer 1

The correct option is C $o->p->m-$

The order of acidic character, $o-,p-$, and $m$-$cyanoanilinium$ ions is $o-cyanoaniliniumion>p-cyanoaniliniumion>m-cyanoaniliniumion$
$o-cyanoanilinium$ ion is most acidic due to the fact that the $-I$ and $-R$ effects in the ortho isomer are stronger than in p isomer.