$ClC{H}_{2}COOH$ is heated with fuming $HN{O}_3$ in the presence of $AgN{O}_3$ is carius tube. After filtration and washing a white precipitate is obtained. The precipitate is of 

The sodium fusion extract is boiled with dilute nitric acid and cooled. The fusion extract is divided into three parts and silver nitrate solution
is added to each part. Appearance of white precipitate, soluble in ammonium hydroxide indicates the presence of chlorine. A pale yellow precipitate,
sparingly soluble in ammonium hydroxide indicates bromine and yellow precipitate, insoluble in ammonium hydroxide indicates iodine in the organic compound respectively.

$C{l}^{-}+{\mathrm{Ag}}^{+}⟶\mathrm{AgCl}$