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Question

(C) The stability of carbocations is determined by the electronic effects of the substituents attached to the benzene ring. $(a)$ The tert-butyl group

Vedclass · Accepted Answer

$c > d > a > b$

Vedclass · Answer

(C) The stability of carbocations is determined by the electronic effects of the substituents attached to the benzene ring. $(a)$ The tert-butyl group shows a $+I$ effect,which stabilizes the carbocation. $(b)$ The $-NO_2$ group shows a $-M$ effect,which strongly destabilizes the carbocation. $(c)$ The $-O-CO-CH_3$ group shows a $+M$ effect (due to the lone pair on oxygen),which significantly stabilizes the carbocation. $(d)$ The $-CH_3$ group shows a $+H$ (hyperconjugation) effect,which stabilizes the carbocation. Comparing the effects: $+M > +H > +I > -M$. Therefore,the order of stability is $c > d > a > b$.

Determine the correct order of stability for the following carbocations:

Similar Questions

Arrange the following compounds in increasing order of the rate of aromatic electrophilic substitution reaction:

The decreasing order of reactivity towards electrophilic substitution for the following compounds is:

The decreasing order of stability of the following anions is:
$(P)$ $p-OCH_3-C_6H_4-CH_2^-$
$(Q)$ $p-CHO-C_6H_4-CH_2^-$
$(R)$ $p-Cl-C_6H_4-CH_2^-$
$(S)$ $p-CH_3-C_6H_4-CH_2^-$

Arrange the following in the increasing order of stability:
$(a) \ CH_3CH=CH-CHO$
$(b) \ CH_3-CH^+-CH=C(O^-)H$
$(c) \ ^+CH_2-CH=CH-CHO$

Which one of the following orders is correct regarding the inductive effect of the substituents?

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