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(B) The reactivity towards electrophilic aromatic substitution depends on the electron density of the benzene ring.$1$. The $-OCH_3$ group in $III$ (A

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$III > I > II > IV$

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(B) The reactivity towards electrophilic aromatic substitution depends on the electron density of the benzene ring.$1$. The $-OCH_3$ group in $III$ (Anisole) is a strong electron-donating group by resonance ($+R$ effect),which significantly increases the electron density of the ring.$2$. The $-CH_3$ group in $I$ (Toluene) is an electron-donating group by hyperconjugation and inductive effect ($+I$ effect),which increases the electron density of the ring,but less effectively than the $-OCH_3$ group.$3$. $II$ (Benzene) has no substituent,so it has standard electron density.$4$. The $-CF_3$ group in $IV$ (Trifluoromethylbenzene) is a strong electron-withdrawing group by inductive effect ($-I$ effect),which significantly decreases the electron density of the ring.Therefore,the decreasing order of reactivity is $III > I > II > IV$.

Find the decreasing order of reactivity towards electrophilic substitution reaction for the following compounds:
$I$: Toluene $(C_6H_5CH_3)$
$II$: Benzene $(C_6H_6)$
$III$: Anisole $(C_6H_5OCH_3)$
$IV$: Trifluoromethylbenzene $(C_6H_5CF_3)$

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Find the decreasing order of reactivity towards electrophilic substitution reaction for the following compounds:$I$: Toluene $(C_6H_5CH_3)$$II$: Benzene $(C_6H_6)$$III$: Anisole $(C_6H_5OCH_3)$$IV$: Trifluoromethylbenzene $(C_6H_5CF_3)$