The following compound has four aromatic ring | vedclass

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(B) The reactivity of an aromatic ring towards electrophilic aromatic substitution $(EAS)$ depends on the nature of the substituents attached to it. E

Vedclass · Accepted Answer

$C < B < D < A$

Vedclass · Answer

(B) The reactivity of an aromatic ring towards electrophilic aromatic substitution $(EAS)$ depends on the nature of the substituents attached to it. Electron-donating groups $(EDG)$ increase reactivity,while electron-withdrawing groups $(EWG)$ decrease it.$1$. Ring $A$ is attached to an $-N(CH_3)-$ group,which is a strongly activating group due to the strong $+M$ effect of the nitrogen lone pair.$2$. Ring $B$ is attached to an alkyl chain,which acts as a weakly activating group due to the $+I$ effect and hyperconjugation.$3$. Ring $C$ is attached to a carbonyl group $(-C=O)$,which is a strongly deactivating group due to the $-M$ and $-I$ effects.$4$. Ring $D$ is attached to an oxygen atom of an ester group $(-O-C=O-)$,which acts as a moderately activating group due to the $+M$ effect of the oxygen lone pair,although it is also electron-withdrawing by the $-I$ effect.Comparing these,the order of reactivity is $C$ (deactivated) $< B$ (weakly activated) $< D$ (moderately activated) $< A$ (strongly activated). Thus,the correct order is $C < B < D < A$.

The following compound has four aromatic rings marked as $A$,$B$,$C$ and $D$. Rank them in terms of increasing reactivity towards electrophilic aromatic substitution?

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