Q. Vapour density of an organic compound is $23$. It contains $52.17\%$ of carbon and $13\%$ of hydrogen. The compound gives iodoform test. The compound is :
Haloalkanes and Haloarenes
Solution:
We know that, moleculer mass = 2 $\times$ v.d.
$\Rightarrow $ molecular mass of the given organic compound is 46.
%
Atomic mass
$\frac{\% \text{ composition} }{\text{atomic mass}}$
Wh. one no.ratio
C
52.17
12
4.3475
2
H
13
1
13
6
O
34.83
16
2.176875
1
So, Formula of the compound = $ (C_2H_6O)_n$
$ n = \frac{46}{46} = 1 \, \Rightarrow $ molecular formula is $ (C_2H_6O)$
The compound also gives iodoform test so, it would contain -OH group or
As our molecular formula contains two carbon atoms. So, the organic compound is
ethanol.
| % | Atomic mass | $\frac{\% \text{ composition} }{\text{atomic mass}}$ | Wh. one no.ratio | |
|---|---|---|---|---|
| C | 52.17 | 12 | 4.3475 | 2 |
| H | 13 | 1 | 13 | 6 |
| O | 34.83 | 16 | 2.176875 | 1 |