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(B) The reactivity of a benzene ring towards electrophilic aromatic substitution depends on the electron density of the ring.$1.$ $Toluene$ $(IV)$ has

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$IV > II > I > III$

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(B) The reactivity of a benzene ring towards electrophilic aromatic substitution depends on the electron density of the ring.$1.$ $Toluene$ $(IV)$ has a methyl group $(-CH_3)$,which is an electron-donating group ($+I$ effect and hyperconjugation),increasing electron density.$2.$ $Benzene$ $(II)$ is the reference compound.$3.$ $Chlorobenzene$ $(I)$ has a chlorine atom,which is deactivating due to its strong $-I$ effect,although it is ortho/para directing due to resonance ($+M$ effect).$4.$ $Anilinium$ $chloride$ $(III)$ contains the $-NH_3^+$ group,which is a strong electron-withdrawing group ($-I$ effect),significantly reducing electron density.Therefore,the 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