Question

The pair of structures given below represent

(A) enantiomers

(B) diastereomers

(C) structural isomers

(D) two molecules of the same compound.

Answer 1

Convert these Newmann projections into open chain structures.

Both structures have same molecular formula $\mathrm{C}_4 \mathrm{H}_9 \mathrm{Cl}$, thus these are isomers. However, the two have different groups, viz $\mathrm{CH}_3$ and $\mathrm{CH}_2 \mathrm{Cl}$, So these are neither enantiomers nor diastereomers. Hence, these are structural isomers.

So, The correct option will be (C).