`8c,c,` of gaseous hydrocarbon requires `40c.c.` of `O_(2)` for complete combustion. Identify hydrocarbon.

Explanation

Volume of hydrocarbon `=8c.c.`: Volume of `O_(2)=40c.c`
Formula No. `1, (8)/(40)=(2)/(3n+)` (For alkane)
`(1)/(5)=(2)/(3n+1)` or `3n+1=10` or `3n=10-1=9 , n=3`
The value of `n` comes in whole number from `1st` formula it means hydrocarbon is alkane and it is of `3C` atom.
`therefore` Hydrocarbon is `C_(3)H_(8)` (Prospane)