In the given reaction,electrophilic substitut | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

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 $(3)$

Vedclass · Answer

(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?

Similar Questions

What are the main types of organic reactions and their mechanisms?

An organic compound $A$,$C_5 H_8 O$,reacts with $H_2 O$,$NH_3$,and $CH_3 COOH$ as shown in the reaction scheme. Identify $A$.

In the reaction given below,the total number of atoms having $sp^2$ hybridization in the major product $P$ is. . . . .

The order of decreasing reactivity in electrophilic addition of the following compounds is
$(I) \, Ph-CH=CH-COOH$
$(II) \, p-NO_2-C_6H_4-CH=CH-COOH$
$(III) \, p-MeO-C_6H_4-CH=CH-COOH$
$(IV) \, p-Cl-C_6H_4-CH=CH-COOH$

In which of the following reactions is a carbanion $NOT$ formed as an intermediate?

Vedclass Test Series

Exam Paper Generator

Online Exam Module