Q 1230267112.     A mixture of `C_2H_2` and `C_3H_8` occupied a certain volume at `80 mm` `Hg`. The mixture was completely burnt to `CO_2` and `H_2O(l).` When the pressure of `CO_2` was found to be `230 mm` `Hg` at the same temprature and volume, the fraction of `C_2H_2` in mixture is

A

`0.125`

B

`0.5`

C

`0.85`

D

`0.25`

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