Which of the following are unsaturated hydrocarbons?

Propane

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Butene

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Propyne

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Ethane

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Solution

The correct options are
B Butene
C Propyne
Butene or but-1-ene and propyne or prop-1-yne are unsaturated hydrocarbons as they contain double bonded and triple bonded carbon atoms in them respectively. Their structures are shown below.

However, propane and ethane are saturated hydrocarbons as they contain only single bonds between the carbon atoms in them.

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