Chapter 9, Problem 84P

Interpretation Introduction

Interpretation:

Major product formed when given compounds undergoes E1 reaction is to be identified.

Concept Introduction:

An E1 reaction is stereo selective.  Both E and Z stereoisomers are formed regardless of the number of hydrogens bonded to the $\text{β-carbon}$.  Major product is the one with largest groups on the opposite sides of the double bond because that is the more stable alkene