Question

multiple choice 2 points
identify each of the given pairs as either constitutional isomers, enantiomers, diastereomers, or identical compounds.
(a) and (b) and
(a) identical compounds (b) enantiomers
(a) diastereomers (b) enantiomers
(a) enantiomers (b) diastereomers
(a) enantiomers (b) constitutional isomers
previous

Explanation:

Step1: Analyze pair (a)

The two structures in pair (a) have the same connectivity and the same configuration at the chiral centers. Rotating one structure can superimpose it on the other, so they are identical compounds.

Step2: Analyze pair (b)

The two structures in pair (b) are non - superimposable mirror images of each other. They have the same connectivity but opposite configurations at all chiral centers, which is the definition of enantiomers.

Answer:

A. (a) Identical compounds
(b) Enantiomers