Question

(2R,4S)-2,4-Dichloropentane and (2S,4R)-2,4-dichloropentane are:

• A. diastereomers
• B. constitutional isomers
• C. enantiomer
• D. identical

Answer 1

The correct option is D identical

2,4-Dichloropentane has two chlorine atoms at carbon number 2 and 4. Hence we can number it from both sides and hence even if the configuration is changed from 2R,4S to 2S,4R, it will not make any change. Hence the two molecules are identical.