Chapter 11, Problem 31P

Interpretation Introduction

Interpretation:

Structure of the conjugate base of the given alkene is to be provided and using resonance the sharing of negative charge among the various carbons is to be shown.

Concept introduction:

Conjugated dienes contains two $C=C$ units joined by a single bond that can be represented by $C=C-C=C$.

A conjugate base is formed when a species loses a proton. A conjugate base of a conjugated diene is planar and thus can be stabilized through electron delocalization.

The way of describing bonding in certain molecule or ion by combination of several contributing structures is known as resonance structures.