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 C 1 of the ring.

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Step 1: add a curved arrow. Select Draw Templates More / " C H Br 0 Br : :o: Erase H H H H Q2Q Step 2: Draw the intermediates and a curved arrow. Select Draw Templates More MacBook Air / " C H Br 0 9 Q Erase 2Q

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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.

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Step 1: add a curved arrow. Select Draw Templates More / " C H Br 0 Br : :o: Erase H H H H Q2Q Step 2: Draw the intermediates and a curved arrow. Select Draw Templates More MacBook Air / " C H Br 0 9 Q Erase 2Q

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