Which of the following statements is/are correct?

Options

A. When a lassaigne's solution is heated with dil. `HNO_3`, cooled and `AgNO_3` solution is added, a yellow precipitate, partially soluble in `NH_3` or `NH_4OH` indicates the presence of iodine is organic compound.
B. When `(CH_3COO)_4Pb` solution is added to the acidified lassaigne's extract of an organic compound, a black precipitate of `PbS` is formed.
C. An organic compound containing N, on heating with conc. `H_2SO_4` gives `(NH_4)_2SO_4` which liberates `NH_3` of treatment with excess of `NaOH`.
D. The molecular mass of a non-volatile organic compound is determined either by dumas method or by Victor Meyer's method.

Answer

B, C

Explanation

(a). Indicates the presence of `Br`.
(d). Victor Meyer's method is used to determie molecular mass of volatile organic compound. Duman method is used to determine percentage of N. The molecualr mass of non volatile compound is determined by depression is freezing point or by elevation in boiling point method.