In the given reaction,electrophilic substitut | vedclass

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Question

(D) The given molecule is $chroman$ (a bicyclic compound with a benzene ring fused to a dihydropyran ring). The oxygen atom in the ring has lone pairs

Vedclass · Accepted Answer

Both $(1)$ and $(3)$

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(D) The given molecule is $chroman$ (a bicyclic compound with a benzene ring fused to a dihydropyran ring). The oxygen atom in the ring has lone pairs of electrons,which exert a $+M$ (mesomeric) effect,activating the benzene ring towards electrophilic aromatic substitution. The oxygen atom is attached to the benzene ring at the position adjacent to position $1$. Due to the $+M$ effect,the electron density increases at the ortho and para positions relative to the oxygen atom. In this structure,position $1$ is ortho to the oxygen,and position $3$ is para to the oxygen. Therefore,electrophilic substitution occurs at both positions $1$ and $3$.

In the given reaction,electrophilic substitution takes place at which position?

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