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Classify each pair of compounds as constitutional isomers or stereoisomers.

Short Answer

Expert verified

The compounds in options a, b and c are all constitutional isomers and the compounds given in option d are stereoisomers.

Step by step solution

01

Constitutional Isomers

Compounds that have the same molecular formula but exist as different structures (i.e., adopts different structures) are termed as constitutional isomers.

02

Stereoisomers

The structures/compounds that differ only in the three-dimensional (3D) arrangement of atoms are referred to as stereoisomers.

03

Constitutional and Stereoisomers

a. Compounds 1 and 2 (from the left) differ only in the arrangement of groups i.e., they have the same molecular formula and different structural formula.

Therefore, the compounds in a are constitutional isomers.

b. In this case, the compounds differ only by their structure and hence they are constitutional isomers.

c. The two compounds differ in the position of the methyl groups i.e., there is a change in their structural formula.

Therefore, the given compounds are constitutional isomers.

d. The given compounds have the same molecular and structural formula, and they differ only by their arrangement in space i.e., the methyl groups in the given structures adopt different orientations.

Therefore, they are stereoisomers.

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