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)` Which of the following can give addition reactions? `C_(2)H_(6), C_(3)H_(8), C_(3)H_(6), C_(2)H_(6), C_(2)H_(2), CH_(4)` Give reason for your choice.