12. Which structure(s) represent(s) diastereomer(s) of I?
A) II
B) II and III
C) II and IV
D) III and V
13. (2R, 4S) –2, 4–Dichloropentane and (2S, 4R)-2, 4-dichloropentane are:
A) Enantiomers
B) Diastereomers
C) Identical
D) Constitutional isomers
15. Which of the following is/are optically inactive?
A) Every achiral compound
B) A racemic mixture
C) A meso compound
D) A 50-50 mixture of R and S enantiomers
E) All the above
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