Question

The total number of isomers (including stereoisomers) possible for a compound with the molecular formula $C_5{H}_{10}$ is:

Answer 1

Degree of unsaturation for $C_5{H}_{10}=5-\frac{10}{2}+1=1$
So all the possible cyclic structures will be saturated.

Hence, the total number of isomers are 7.