Heat of combustion of CH(4),C(2)H(4),C(2...

Heat of combustion of `CH_(4),C_(2)H_(4),C_(2)H_(6)` are `-890,-1411` and `-1560 kJ //mol` respectively. Which has the lowest calorific fuel value ?

`CH_(4)`

`C_(2)H_(4)`

`C_(2)H_(6)`

All of the above

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