Question

# 10ml of gaseous Hydrocarbon on combustion gives 40ml of CO2 gas and 50ml H2O (Vapour). The Hydrocarbon is______.

A

C4H5

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B

C4H8

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C

C4H10

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D

C8H10

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Solution

## The correct option is C C4H10Hydrocarbon on complete combustion gives carbon dioxide(CO2) gas and Water vapour (H2O). The ratio of volumes = 10:40:50 = 1:4:5All mole of carbon from hydrocarbon is converted into Carbon dioxide.As 10ml of a hydrocarbon produces 40ml. So from the ratio of volume Hydrocarbon carbon: Carbon dioxide::1:4 So, 1 mole of hydrocarbon has four moles of carbon. All the hydrogen from hydrocarbon is converted into water.As10ml of a hydrocarbon produces 50ml. Each water molecule has 2 moles of H atoms.So from the ratio of volume Hydrocarbon carbon: Water::1:10.So, 1 mole of hydrocarbon has ten moles of Hydrogen. Thus, option (C) is the correct answer, i.e. Hydrocarbon is ${\mathrm{C}}_{4}{\mathrm{H}}_{10}$.

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