Chapter 25, Problem 92AP

Interpretation Introduction

Interpretation:

The planes of symmetry and the stereoisomeric relationship are to be identified in the given compounds.

Concept introduction:

The ability of certain substances to rotate the plane of the plane-polarized light, as it passes through a crystal, liquid, or solution, is known as optical activity.

The rotation of the polarized light could be in clockwise or counterclockwise direction.

If the rotation of the polarized light will be in clockwise, it is dextrorotatory.

If the rotation of the polarized light will be in counterclockwise, it is leavorotatory. An imaginary plane that divides the molecule into two mirror-image halves is known as the plane of symmetry.

When isomeric molecules contain the same molecular formula but different arrangement of atoms in a three-dimensional space, it is known as stereoisomer.

When isomeric molecules have the same molecular formula but differ in bonding patterns and atomic organization, they are known as constitutional isomers.