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  4. In Carius method, halogen containing organic compound is heated with fuming nitric acid in the presence of :

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Q. In Carius method, halogen containing organic compound is heated with fuming nitric acid in the presence of :

JEE MainJEE Main 2021Organic Chemistry – Some Basic Principles and Techniques

Solution:

Organic compound is heated with fuming nitric acid in the presence of silver nitrate in carius method.
Lunar caustic $\left( AgNO _{3}\right)$ is used as reagent hare to distinguish $Cl ^{-}, Br$ and $I^{-}$respectively as follows.
$Cl^-(aq) \xrightarrow{AgNO_3}AgCl \downarrow ppt$ white
$Br^-(aq) \xrightarrow{AgNO_3}AgBr\downarrow ppt$ pale yellow
$I^-(aq) \xrightarrow{AgNO_3} AgI \downarrow ppt$ Dark yellow