Which order is correct for the decreasing rea | vedclass

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(B) Ring monobromination is an electrophilic aromatic substitution reaction.The reactivity of the benzene ring depends on the nature of the substituen

Vedclass · Accepted Answer

$I > III > II > IV$

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(B) Ring monobromination is an electrophilic aromatic substitution reaction.The reactivity of the benzene ring depends on the nature of the substituent group.Activating groups (electron-donating groups like $-CH_3$) increase the electron density on the ring and increase reactivity,while deactivating groups (electron-withdrawing groups like $-COOH$ and $-NO_2$) decrease the electron density and decrease reactivity.Benzene $(III)$ is more reactive than rings with deactivating groups but less reactive than rings with activating groups.Among the deactivating groups,$-NO_2$ is more strongly deactivating than $-COOH$.Therefore,the correct decreasing order of reactivity is: $C_6H_5CH_3$ $(I)$ > $C_6H_6$ $(III)$ > $C_6H_5COOH$ $(II)$ > $C_6H_5NO_2$ $(IV)$.

Which order is correct for the decreasing reactivity to ring monobromination of the following compounds: $C_6H_5CH_3$ $(I)$,$C_6H_5COOH$ $(II)$,$C_6H_6$ $(III)$,and $C_6H_5NO_2$ $(IV)$?

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