Question

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

Answer 1

The molecular formula of a cyclic hydrocarbon is C₄H₈, as it satisfies the general formula of a cyclic hydrocarbon, i.e. C_nH_2n. Here, the number of hydrogen atoms is already given as 8, i.e. 2n = 8.
Therefore, n = 8/2 = 4. Here, n represents the number of carbon atoms. Therefore, the molecular formula is C₄H₈.
The structural formula of the cyclic hydrocarbon C₄H₈ is as follows​: