20 mL of a gaseous hydrocarbon is explod...

20 mL of a gaseous hydrocarbon is exploded with excess oxygen in an eudiometer tube and the contraction in volume was 70 mL. Vapour density of the hydrocarbon is 29. Find its molecular formula

`C_5H_12`

`C_8H 10

`C_3H_6`

`C_4H_10`

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