500 ml of a hydrocarbon gas burnt in exc...

500 ml of a hydrocarbon gas burnt in excess of oxygen yields 2500 ml of `CO_2` and 3 litres of water vapours. All volume being measured at the same temperature and pressure. The formula of the hydrocarbon is :

`C_(4)H_(10)`

`C_(5)H_(12)`

`C_(2)H_(2)`

`C_(5)H_(10)`

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