(A) COCl₂: This is phosgene, which is used to distinguish between primary, secondary, and tertiary amines by forming amides with primary amines, imides with secondary amines, and no reaction with tertiary amines. This corresponds to (I).
(B) SOCl₂: This is thionyl chloride, which is a poisonous gas and is commonly used for chlorinating alcohols or converting amides to acyl chlorides. This corresponds to (II).
(C) NH₂SO₃H: This is sulphamic acid, which is involved in the synthesis of primary amines through reactions like reduction. This corresponds to (III).
(D) C₆H₅NH₂: This is aniline, which forms a zwitter ion (a molecule with both positive and negative charges) in certain conditions. This corresponds to (IV).
Thus, the correct matching is Option B.
Benzene diazonium chloride on treatment with reagent 'X' gives iodobenzene. The reagent ‘X’ is
The descending order of basicity of following amines is :
Choose the correct answer from the options given below :