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10 ml of a gaseous hydrocarbon burnt in ...

10 ml of a gaseous hydrocarbon burnt in excess of oxygen and reaction mixture is cooled to room temperature. Now volume of reaction mixture decreased by 25 ml, When compared with initial volume. Now the reaction mixture passed through caustic potash solution then again volume decreased by 30 ml. if all volumes are measured under similar conditions .The molecular formula of hydrocarbon is
A) `CH_3`
B) `C_2H_4`
C) `C_3H_6`
D) `C_4H_8`

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