Which factor/s will increase the reactivity of gt C =O group (i) Presence of a group with positive inductive effect (ii) Presence of a group with negative inductive effect (iii) Presence of large alkyl group

Which factor/s will increase the reactivity of gt C =O group (i) Prese

1.	Which factor/s will increase the reactivity of gt C =O group (i) Presence of a group with positive inductive effect (ii) Presence of a group with negative inductive effect (iii) Presence of large alkyl group
Answer» Only (i) Only (ii) (i) and (III) (ii) and (iii) Solution :The reactivity of the carbonyl group towards the addition reaction depends upon the magnitude of the positive charge on the carbonyl carbon ATOM. Hence, any substituent that INCREASES the +ve charge on the carbonyl carbon must increase its reactivity towards addition REACTIONS. the introduction of negative group `(-I` effect) increase the reactivity while introduction of alkyl group `(+I` effect) decreases the reactivity. Large and bulky group CREATES hindrance in approach towards carbonyl carbon. so, large alkyl group decreases the reactivity of `gt C = O` group.