Chapter 7.SE, Problem 25VC

Interpretation Introduction

Interpretation:

The alkyl bromide shown is 1-bromo-1-ethyl-3-methylcyclohexane. The structures of three different alkenes that will yield this alkyl bromide on adding HBr are to be identified.

Concept introduction:

In electrophilic addition reactions, the first step is the attack of the π electrons of the double bond on the hydrogen of the hydrogen halide to yield a carbocation. One of the carbon in C = C gets attached to hydrogen while the other acquires a positive charge. In the second step, the carbocation produced reacts with a halide ion to give the alkyl halide. In the three alkenes therefore, the double bonds should be in a position to yield a carbocation on C₁ of the ring.