`2 g` of an organic nitrogen`-`containing compound, on heating, decomposes to give `0.4 g` of nitrogen. What should be nature of the compound ?

Options

A. `C_(3)H_(7)N_(2)Cl`
B. `C_(6)H_(5)N_(2)Cl`
C. `(CH_(3))_(3)N`
D. Data insufficient

Answer

b

Explanation

`N-underset(2g)("containing compound))overset(heat)rarrunderset(0.4g)(N)`
`0.4g` of `N_(2)` is obtained from `2g` of compound.
`28g` of `N_(2)` is obtained from `(2)/(0.4)xx28=140`
Hence molecular weight of the compound is 140 which coincides with
`C_(6)H_(5)Cl(72+5+28+35.5=140.5).`