Chapter 3, Problem 13E

Interpretation Introduction

Interpretation: The reason behind the representation of allene on the right more accurate than the one on the left in below figure should be explained.

  

Concept introduction: Bonds formed due to head-to-head overlap are termed sigma bond while ones formed by sideways or lateral overlap are named pi-bonds.

The planar system or‘ $s{p}^2$ hybridized present in molecules such as ethylene as illustrated follows:

  

Each carbon in ethylene is trigonal planar due to $s{p}^2$ hybridization. The right ethylene molecule as it shows all bonds in same plane. The one on right that has wedge and dash bonds indicate the one bond lie above and below the plane respectively.