Chapter 15.4, Problem 15.4P

Interpretation Introduction

To determine: The resonance form for the substituted allylic cations in the preceding figures along with explanation of more or less resonance contributor of resonance forms.

Interpretation: The resonance form for the substituted allylic cations in the preceding figures is to be drawn. The second resonance form is a more important or less important resonance contributor than the first structure is to be shown.

Concept introduction: Allenes are the compounds in which two adjacent double bonds share common carbon atoms. These are also known as cumulative dienes. Cumulative dienes are different from conjugated dienes because conjugated dienes comprise double bonds separated by one single bond.