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(A) The reactivity of benzene derivatives towards electrophilic substitution depends on the electron density of the benzene ring. Electron-donating gr

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$(i) > (ii) > (iii) > (iv)$

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(A) The reactivity of benzene derivatives towards electrophilic substitution depends on the electron density of the benzene ring. Electron-donating groups increase the electron density (activating groups),while electron-withdrawing groups decrease it (deactivating groups).$(i)$ $-OCH_3$: This group exerts a strong $+M$ (mesomeric) effect,which significantly increases the electron density on the benzene ring,making it highly reactive.(ii) $-CH_3$: This group exerts a $+I$ (inductive) effect and hyperconjugation,which increases the electron density,but less effectively than the $+M$ effect of $-OCH_3$.(iii) Benzene: This is the reference compound with no substituents.(iv) $-CF_3$: This group exerts a strong $-I$ effect,which significantly decreases the electron density on the benzene ring,making it the least reactive.Therefore,the decreasing order of reactivity is $(i) > (ii) > (iii) > (iv)$.

In the below mentioned compounds,the decreasing order of reactivity towards electrophilic substitution is:

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