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Select alkene and alkyne from the following: 

C6H12, C3H4, C2H4, CH4, C4H8, C5H8

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Best answer

The general molecular formula of alkenes and alkynes containing ‘n’ number of carbon atoms is CnH2n and CnH2n-2.

Using this one can see that, 

Alkenes: C6H12, C2H4, C4H8 

Alkynes: C3H4, C5H8 

Note that molecular formula alone is not sufficient to uniquely identify a compound. For example, C6H12 can mean hexane (unsaturated hydrocarbon) as well as cyclohexane (saturated cyclic hydrocarbon).

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