Chapter 9, Problem 9.77AP

Interpretation Introduction

Interpretation:

The stereoisomers between $A$ and $B$ which undergoes $\text{β}$-elimination most rapidly with sodium ethoxide in ethanol is to be stated. The corresponding reason is to be explained.

Concept introduction:

An elimination reaction is a type of reaction in which two atoms are eliminated in the presence of solvent. Elimination reactions usually favors in the alcoholic conditions. The β-elimination follows $\text{E2}$ mechanism in which both bromine atom and hydrogen atom are in either antiperiplanar direction or synperiplanar direction.