Chapter 7, Problem 53P

Interpretation Introduction

Interpretation:

Theelementary steps depicting the mechanisms of each of the given reaction are to be written.

Concept introduction:

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The dehydration of secondary and tertiary alcohol proceeds through $\text{E1}$ mechanism.

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The $\text{E1}$ mechanism involves the formation of carbocations.

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Thestability order of carbocation is methyl $<$ primary $<$ secondary $<$ tertiary.

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The carbocation may be rearrangedbyshift of hydride oralkyl group of adjacent carbons.

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The selection of hydride or alkyl group shift depends on the stability of the carbocation formed.