If the molecular formula of an organic compound is $C_{10} H_{18}$ it is:

Alkene

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Alkane

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Alkyne

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Not a hydrocarbon

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Solution

The correct option is C Alkyne
If the molecular formula of an organic compound is $C_{10} H_{18}$ it is alkyne. The general formula of alkyne is $C_{n} H_{2 n - 2}$ .
If the molecular formula of an organic compound is $C_{10} H_{22}$ it is alkane. The general formula of alkane is $C_{n} H_{2 n + 2}$ .
If the molecular formula of an organic compound is $C_{10} H_{20}$ it is alkene. The general formula of alkene is $C_{n} H_{2 n}$ .

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