In the Carius method for the estimation of halogen,$0.172 \ g$ of an organic compound showed the presence of $0.08 \ g$ of bromine. Which of these is the correct structure of the compound?

Sodium fusion extract of an organic compound $(Y)$ with $CHCl_3$ and chlorine water gives a violet color to the $CHCl_3$ layer. $0.15 \ g$ of $(Y)$ gave $0.12 \ g$ of the silver halide precipitate in the Carius method. The percentage of halogen in the compound $(Y)$ is . . . . . . . (Nearest integer). (Given: molar mass $g \ mol^{-1} C : 12, H : 1, Cl : 35.5, Br : 80, I : 127$)

Kjeldahl's method is used in the estimation of:

In the estimation of sulphur by Carius method,$0.468 \,g$ of an organic sulphur compound afforded $0.668 \,g$ of barium sulphate. Find out the percentage of sulphur in the given compound. (in $\%$)

For which of the following compounds can the Kjeldahl method be used to determine the percentage of nitrogen?

The number of moles of $CuO$ that will be utilized in the Dumas method for the estimation of nitrogen in a sample of $57.5 \ g$ of $N,N$-dimethylaminopentane is $..... \times 10^{-2}$. (Nearest integer)