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Question

A volume of gaseous hydrocarbon was exploded with an excess of oxygen. The observed contraction was 2.5V, and on treatment, with potash, there was a further contraction of 2V. What is the molecular formula of the hydrocarbon?

A
C2H6
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B
C3H6
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C
C6H10
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D
C2H4
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Solution

The correct option is A C2H6
Initial volume of Hydrocarbon =V ml
CxHy+(x+y4)O2xCO2+y4H2O
xVy2V
on treatment with potash CO2 will absorb
xV=2V
x=2
Contration of volume 2.5 V is due to formula of H2O contract is due to decomponiter CxHy for moles of H2O but in H2O then the Hydrogen
V+Vr4=2.5 V
4V+Vy=10 V
Vy=6|V
y=6
Formula =C2H6 option A

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