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A gaseous hydrocarbon has 85%C and its v...

A gaseous hydrocarbon has `85%C` and its vapour density is `28`. The possible formula of the compound is

A

`C_(3)H_(6)`

B

`C_(2)H_(2)`

C

`C_(3)H_(8)`

D

`C_(4)H_(8)`

Text Solution

Verified by Experts

The correct Answer is:
D
`%C=85`, `%=H=15`
`{:("Element","Percentage","Mole","Mole ratio"),(C,85,85//12=7.08,1),(H,15,15//1=15,2):}`
Empirical formula `=CH_(2)`
Empirical formula mass `=12+2=14`
Molecular mass `=28xx2=56`
`n=(56)/(14)=4`
Molecular formula `=(CH_(2))_(4)=C_(4)H_(8)`
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