Are the following pairs identical, enantiomers, diastereomers, or constitutional isomers?
(a) and
(b) and
(c) and
(d) and

Question

Are the following pairs identical, enantiomers, diastereomers, or constitutional isomers? (a) and (b) and (c) and (d) and

TestHub · Accepted Answer

Ans. (A) (a) Diastereomers (b) Enantiomers (c) Enantiomers (d) Constitutional isomers.

Sol. (a) cis-1-chloro-2-methylcyclopentane vs its trans form: one centre retained, one inverted : diastereomers.

(b) Both centres inverted (wedge-wedge vs dash-dash) and the cis molecule is chiral : enantiomers.

(c) Both centres inverted between the two trans drawings : enantiomers.

(d) 1-chloro-3-methylcyclopentane vs 1-chloro-2-methylcyclopentane: the substituents are on different ring carbons : constitutional isomers.

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