Whether the two structures in each of the given pairs represent constitutional isomers, different conformations of the same compound, or stereoisomers that cannot be interconverted by rotation about single bonds is to be determined. Concept introduction: Different compounds having same molecular formula are called isomers. They can either differ in connectivity or differ in the arrangement of atoms in space. Different spatial arrangements of a molecule are made by rotation about single bonds. These structures are called as conformations, that is., structures can be made identical by rotation around one or more single bonds. Stereoisomers have the same constitution but they have different special arrangement of atoms.

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Chapter 3, Problem 27P

Interpretation Introduction

Interpretation:

Whether the two structures in each of the given pairs represent constitutional isomers, different conformations of the same compound, or stereoisomers that cannot be interconverted by rotation about single bonds is to be determined.

Concept introduction:

Different compounds having same molecular formula are called isomers. They can either differ in connectivity or differ in the arrangement of atoms in space.

Different spatial arrangements of a molecule are made by rotation about single bonds. These structures are called as conformations, that is., structures can be made identical by rotation around one or more single bonds.

Stereoisomers have the same constitution but they have different special arrangement of atoms.

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