10 ml gaseous hydrocarbon was burnt comp...

10 ml gaseous hydrocarbon was burnt completely in 80 ml of `O_(2)` at NTP. The remaining gas occupied 70 ml at NTP. This volume became 50 ml on treatment with KOH solution. The empirical formula of the hydrocarbon is :

`C_2H_4`

`CH_4`

`C_2H_2`

`C_2H_6`

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