Question

An organic compound contains `C,H` and `O` in the proportion of `6:1:8` by weight, respectively. Its vapour density is 30. Its molecular formula will be
A. `C_(2)H_(4)O_(2)`
B. `CH4O`
C. `CH_(2)O`
D. `C_(3)HO`

Answer 1

Correct Answer - a
`"Element No. of moles Simple ratio"`
`C" "6" "6//12=0.5=1" "1`
`H" "1" "1//1=1=2" "2`
`O" "8" "8//16=0.5=1" "1`
Thus, Empirical formula `=CH_(2)O`
Empiricial formula mass `=30`
Mol. Mass `2xxVD=2xx30=60`
`n=(60)/(30)=2`
Mol. formula`=(CH_(2)O)_(2)=C_(2)H_(4)O_(2).`