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(A) The reactivity of aromatic compounds towards electrophilic substitution $(E^{+})$ depends on the electron density of the benzene ring. Groups that

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$C_6H_5NH_2 > C_6H_5NHCOCH_3 > C_6H_6 > C_6H_5SO_3H$

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(A) The reactivity of aromatic compounds towards electrophilic substitution $(E^{+})$ depends on the electron density of the benzene ring. Groups that donate electrons by resonance ($+R$ or $+M$ effect) increase reactivity,while groups that withdraw electrons ($-R$ or $-I$ effect) decrease it.$1$. $C_6H_5NH_2$: The $-NH_2$ group is a strong activating group due to its lone pair,which is donated to the ring via resonance ($+R$ effect).$2$. $C_6H_5NHCOCH_3$: The $-NHCOCH_3$ group is also activating,but less so than $-NH_2$ because the lone pair on nitrogen is delocalized towards the carbonyl group $(C=O)$,reducing its availability for the ring.$3$. $C_6H_6$: Benzene is the reference compound with no substituents.$4$. $C_6H_5SO_3H$: The $-SO_3H$ group is a strong deactivating group due to its strong electron-withdrawing effect ($-I$ and $-R$ effects).Therefore,the decreasing order of reactivity is: $C_6H_5NH_2 > C_6H_5NHCOCH_3 > C_6H_6 > C_6H_5SO_3H$.

Arrange the following compounds in decreasing order of their reactivity towards electrophilic substitution $(E^{+})$:
$C_6H_5NH_2$,$C_6H_5NHCOCH_3$,$C_6H_6$,$C_6H_5SO_3H$

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Arrange the following compounds in decreasing order of their reactivity towards electrophilic substitution $(E^{+})$:$C_6H_5NH_2$,$C_6H_5NHCOCH_3$,$C_6H_6$,$C_6H_5SO_3H$