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Question

(B) The reactivity of benzene derivatives towards electrophilic substitution depends on the nature of the substituent group attached to the benzene ri

Vedclass · Accepted Answer

$III > I > II > IV$

Vedclass · Answer

(B) The reactivity of benzene derivatives towards electrophilic substitution depends on the nature of the substituent group attached to the benzene ring.Groups that donate electron density to the ring (via $+M$ or $+H$ effects) increase reactivity,while groups that withdraw electron density (via $-I$ or $-M$ effects) decrease reactivity.$III$ $(OCH_3)$: The methoxy group exerts a strong $+M$ effect,which significantly increases the electron density of the ring,making it the most reactive.$I$ $(CH_3)$ and $II$ $(CH_2CH_3)$: Both are alkyl groups that donate electron density via the $+H$ (hyperconjugation) effect. The $+H$ effect is stronger in $CH_3$ than in $CH_2CH_3$ due to the number of $\alpha$-hydrogens available for hyperconjugation ($3$ in $CH_3$ vs $2$ in $CH_2CH_3$). Thus,$I > II$.$IV$ $(Cl)$: The chlorine atom exerts a strong $-I$ effect,which withdraws electron density from the ring,making it the least reactive among the given compounds.Therefore,the correct order of reactivity is $III > I > II > IV$.

Arrange the following compounds in their correct order of reactivity towards electrophilic substitution reaction:

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