Question
What is the molecular formula and structural formula of a cyclic hydrocarbon whose one molecule contains $8$ hydrogen atoms?

Answer

The molecular formula of a cyclic hydrocarbon is $C _4 H _8$ as it satisfies the general formula of a cyclic hydrocarbon, i.e. $C _{ n } H _{2 n}$
Here, the number of hydrogen atoms is already given as 8 , i.e. $2 n =8$. Therefore, $n =\frac{8}{2}=4$.
Here, n represents the number of carbon atoms. Therefore, the molecular formula is $C _4 H _8$.
The structural formula of the cyclic hydrocarbon $C _4 H _8$ is as follows
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