The optically active compounds among the given compounds are to be identified. Concept introduction: The molecules that are non-superimposable or not identical with their mirror images are known as chiral molecules. A pair of two mirror images that are non-identical is known as a pair of enantiomers, and these are optically active. The enantiomers in which the path traced from the highest to the lowest atomic number is in the anticlockwise direction are designated as S provided that among the four groups attached to the chiral carbon, the least priority group is in horizontal position in Fischer projection. The enantiomers in which the path traced from the highest to the lowest atomic number is in the clockwise direction are designated as R provided that among the four groups attached to the chiral carbon, the least priority group is in horizontal position in Fischer projection. . The objects or molecules which are superimposable with their mirror images are achiral objects or molecules. These objects have a centre of symmetry or plane of symmetry. The achiral compounds in which the plane of symmetry is present internally and consists of chiral centres are known as meso compounds, but they are optically inactive.

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Chapter 5, Problem 20PP

Interpretation Introduction

Interpretation:

The optically active compounds among the given compounds are to be identified.

Concept introduction:

The molecules that are non-superimposable or not identical with their mirror images are known as chiral molecules.

A pair of two mirror images that are non-identical is known as a pair of enantiomers, and these are optically active.

The enantiomers in which the path traced from the highest to the lowest atomic number is in the anticlockwise direction are designated as S provided that among the four groups attached to the chiral carbon, the least priority group is in horizontal position in Fischer projection.

The enantiomers in which the path traced from the highest to the lowest atomic number is in the clockwise direction are designated as R provided that among the four groups attached to the chiral carbon, the least priority group is in horizontal position in Fischer projection. .

The objects or molecules which are superimposable with their mirror images are achiral objects or molecules. These objects have a centre of symmetry or plane of symmetry.

The achiral compounds in which the plane of symmetry is present internally and consists of chiral centres are known as meso compounds, but they are optically inactive.

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