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What is the general formula of alkenes ?...

What is the general formula of alkenes ? Identify the alkenes from the following
`C_(2)H_(6),C_(2)H_(4),C_(3)H_(4),C_(2)H_(2),C_(3)H_(6)`

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The general formula of alkenes is `C_(n)H_(2n)` where, n is the number of carbon atoms. Out of the above given hydrocarbons `C_(2)H_(4)` and `C_(3)H_(6)`, are alkenes (because they correspond to the general formula `C_(n)H_(2n)` with n = 2 and n=3, respectively).
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