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(B) The reactivity of benzene derivatives towards electrophilic substitution depends on the electron density of the benzene ring. Substituents that in

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$e > d > a > b > c$

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(B) The reactivity of benzene derivatives towards electrophilic substitution depends on the electron density of the benzene ring. Substituents that increase electron density (electron-donating groups) activate the ring,while those that decrease electron density (electron-withdrawing groups) deactivate the ring.$1$. $-NMe_2$ (in $e$) has a strong $+M$ effect,making it the most reactive.$2$. $-OCH_3$ (in $d$) also has a $+M$ effect,but it is weaker than $-NMe_2$ due to the higher electronegativity of oxygen.$3$. $-CH_3$ (in $a$) shows a $+H$ (hyperconjugation) effect,which is weaker than the $+M$ effect.$4$. Benzene $(b)$ has no substituent.$5$. $-CF_3$ (in $c$) is a strong electron-withdrawing group due to the $-I$ effect,making it the least reactive.Therefore,the decreasing order of reactivity is: $e > d > a > b > c$.

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

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