Question

Which of the following statements regarding 1,2-dimethylcyclopropane (I) and 1,2-dimethylcyclobutane (II) are wrong?

• A. Both of them show three stereoisomers
• B. The cis forms of both are meso and the trans forms of both have a pair of enantiomers
• C. The cis forms of both have a pair of enantiomers and trans forms of both are optically inactive
• D. The meso forms of both are optically inactive due to the presence of a centre of symmetry

Answer 1

Answer: (C), (D)

The correct options are
C The cis forms of both have a pair of enantiomers and trans forms of both are optically inactive
D The meso forms of both are optically inactive due to the presence of a centre of symmetry

Meso forms of both are optically inactive due to the presence of plane of symmetry.