Chapter 17, Problem 17.9P

Interpretation Introduction

(1)

Interpretation:

The reason as to how and why the products are different which is obtained from the reaction of $trans\text{-2-buten-1-ol}$ with concentrated aqueous $\text{HBr}$ is to be stated.

Concept introduction:

The first step of ${\text{S}}_{\text{N}}\text{1}$ and $\text{E1}$ reactions is the heterolysis of carbon halogen bond to form a carbocation. In ${\text{S}}_{\text{N}}\text{1}$ pathway, the next step is substitution while in $\text{E1}$ pathway, the next step is elimination. According to Zaitsev rule, in $\text{E1}$ reactions, the more substituted or more alkylated alkene is the major product as it is more stable.

Interpretation Introduction

(2)

Interpretation:

The reason as to how and why the products are different which is obtained from the reaction of $trans\text{-2-buten-1-ol}$ with $\text{NaBr}$ in acetone is to be stated.

Concept introduction:

The first step of ${\text{S}}_{\text{N}}\text{1}$ and $\text{E1}$ reactions is the heterolysis of carbon halogen bond to form a carbocation. In ${\text{S}}_{\text{N}}\text{1}$ pathway, the next step is substitution while in $\text{E1}$ pathway, the next step is elimination. According to Zaitsev rule, in $\text{E1}$ reactions, the more substituted or more alkylated alkene is the major product as it is more stable.