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(A) The reactivity of aromatic compounds towards electrophilic substitution depends on the electron density of the benzene ring.$1$. The $-CH_3$ group

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$iv > ii > i > iii$

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(A) The reactivity of aromatic compounds towards electrophilic substitution depends on the electron density of the benzene ring.$1$. The $-CH_3$ group in Toluene $(iv)$ is an electron-donating group ($+I$ and hyperconjugation),which increases electron density,making it most reactive.$2$. Benzene $(ii)$ has no substituents.$3$. The $-Cl$ group in Chlorobenzene $(i)$ is electron-withdrawing due to the $-I$ effect,which decreases electron density,making it less reactive than benzene.$4$. The $-NH_3^+$ group in Anilinium chloride $(iii)$ is a strong electron-withdrawing group due to the strong $-I$ effect,making it the least reactive.Thus,the decreasing order of reactivity is $iv > ii > i > iii$.

What is the decreasing order of reactivity amongst the following compounds towards aromatic electrophilic substitution?
$(i)$ Chlorobenzene
$(ii)$ Benzene
$(iii)$ Anilinium chloride
$(iv)$ Toluene

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What is the decreasing order of reactivity amongst the following compounds towards aromatic electrophilic substitution?$(i)$ Chlorobenzene$(ii)$ Benzene$(iii)$ Anilinium chloride$(iv)$ Toluene