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Chains, Branches and Rings

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Question

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

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Solution

The molecular formula of a cyclic hydrocarbon is C₄H₈, as it satisfies the general formula of a cyclic hydrocarbon, i.e. C_nH₂_n. 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 C₄H₈is as follows:

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