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There are four dimethylcyclopropane isom...

There are four dimethylcyclopropane isomers.
a. Write the three-dimensional formulas for these isomers.
b. Which of these isomers is chiral?
c. If a mixtrue consisting of `1 mol` of each of these isomers is subjected to simple gas chromatography, how many fractions would be obtained and how many compounds each fraction will have?
d. How many of these fractions would be optically active?

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b. Both `(3)` and `(4)` are chiral and are enantiomers of each other.
c. Three fractions: a fraction containing `(1)`, a fraction containing `(2)`, and a fraction containing `(3)` and `(4)` [ beacuse, being anantiomers, `(3)` and `(4)` would have the same vapour pressure].
d.
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