Drawn are four isomeric dimethylcyclopropanes.a. How are the compounds in each pair relate...

Drawn are four isomeric dimethylcyclopropanes.

a. How are the compounds in each pair related (enantiomers, diastereomers, constitutional isomers): A and B; A and C; B and C; C and D?

Label each compound as chiral or achiral.

b. Which compounds, alone, would be optically active?

c. Which compounds have a plane of symmetry?

d. How do the boiling points of the compounds in each pair compare: A and B; B and C; C and D?

e. Which of the compounds are meso compounds?

f. Would an equal mixture of compounds C and D be optically active? What about an equal mixture of B and C?