The names which include ( R ) and ( S ) designations for the given compounds are to be given. Concept introduction: The molecules or compounds that are non-superimposable or not identical with its mirror image are known as chiral molecules. The pair of two mirror images that are non-identical is known as enantiomers and are optically active. The enantiomers in which the path traced from the highest atomic number to the lowest atomic number is in 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 atomic number to the lowest atomic number is in 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 that are superimposable with its mirror images are achiral objects or molecules and 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 23PP

Interpretation Introduction

Interpretation:

The names which include (R) and (S) designations for the given compounds are to be given.

Concept introduction:

The molecules or compounds that are non-superimposable or not identical with its mirror image are known as chiral molecules.

The pair of two mirror images that are non-identical is known as enantiomers and are optically active.

The enantiomers in which the path traced from the highest atomic number to the lowest atomic number is in 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 atomic number to the lowest atomic number is in 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 that are superimposable with its mirror images are achiral objects or molecules and 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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