Rank the following compounds in order of incr | vedclass

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Question

(B) The rate of $EAS$ depends on the electron density of the benzene ring. Electron-donating groups increase the rate,while electron-withdrawing group

Vedclass · Accepted Answer

$B < C < A$

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(B) The rate of $EAS$ depends on the electron density of the benzene ring. Electron-donating groups increase the rate,while electron-withdrawing groups decrease it.In compound $(A)$,the oxygen atom is directly attached to the benzene ring,providing electron density via the $+M$ effect,which activates the ring.In compound $(B)$,the carbonyl group $(C=O)$ is directly attached to the benzene ring,which exerts a strong $-M$ effect,deactivating the ring.In compound $(C)$,the oxygen atom is attached to the benzene ring,but the carbonyl group is further away. However,the oxygen atom still provides electron density via the $+M$ effect. Comparing $(A)$ and $(C)$,$(A)$ has a more direct activation effect from the oxygen atom compared to the ester-like linkage in $(C)$.Thus,the order of reactivity is $B < C < A$.

Rank the following compounds in order of increasing rate of reaction towards Electrophilic Aromatic Substitution $(EAS)$ with bromine in the presence of $FeBr_3$.

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