Kjeldahl's method cannot be used to estimate nitrogen for which of the following compounds?

In Carius method for estimation of halogens,$0.2 \, g$ of an organic compound gave $0.188 \, g$ of $AgBr$. The percentage of bromine in the compound is $......$ . (Nearest integer)
[Atomic mass: $Ag=108, Br=80$ ]

In phosphorus estimation,$0.31 \ g$ of an organic compound gave $0.444 \ g$ of magnesium pyrophosphate (molar mass $= 222 \ g \ mol^{-1}$). The percentage of phosphorus in the compound is

In the Carius method of estimation of halogen,$0.15 \ g$ of an organic compound gave $0.12 \ g$ of $AgBr$. Find out the percentage of bromine in the compound.

In the Carius method,$0.099 \, g$ of an organic compound gave $0.287 \, g$ of $AgCl$. The percentage of chlorine in the compound is:

Discuss the Dumas method and its principles for the estimation of $N$ present in an organic compound.