Match the elements of Column I to elements of Column II. There can be single or multiple matches. Column I (a) Coupling reaction (b) Liebermann's nitroso reaction (c) Hinsberg reaction (d) Carbylamine reaction Column II (p) Phenol (q) Aniline (r) N-methylethanamine (s) Tertiary butyl amine

First, let's understand each reaction mentioned in Column I. This will help us determine which compound(s) in Column II are involved in each reaction. (a) Coupling reaction: This type of reaction generally involves the formation of an azo compound when an aromatic amine reacts with a diazonium compound. (b) Liebermann's nitroso reaction: This is a color reaction to distinguish phenols (compound with a hydroxy group attached to a benzene ring) from anilines (the compound with an amino group [-NH2] attached to a benzene ring). A phenol reacts with nitrous acid to give a deep green or blue color, whereas an aniline doesn't change color. (c) Hinsberg reaction: It is used to distinguish primary, secondary, and tertiary amines. Primary amines react with benzene sulfonyl chloride to form a sulfonamide, which is soluble in alkali. Secondary amines also form a sulfonamide but are insoluble in alkali. Tertiary amines do not react at all in this reaction. (d) Carbylamine reaction: This test is used to detect primary amines. In this reaction, primary amines react with chloroform and an alcoholic solution of potassium hydroxide to form an isocyanide with a pungent smell. Now let's check which compound in Column II is involved in each reaction.

(a) Coupling reaction: Aniline (q) is involved in this reaction because it is an aromatic amine. (b) Liebermann's nitroso reaction: This reaction distinguishes phenols from anilines. Thus, both Phenol (p) and Aniline (q) are involved in this reaction. (c) Hinsberg reaction: This reaction is used to distinguish primary, secondary, and tertiary amines. In Column II, we have Aniline (q) as a primary amine, N-methylethanamine (r) as a secondary amine, and Tertiary butyl amine (s) as a tertiary amine. So all three compounds (q), (r), and (s) are involved in the Hinsberg reaction. (d) Carbylamine reaction: Among the compounds in Column II, only Aniline (q) is a primary amine, so it is the compound involved in the Carbylamine reaction.

After analyzing the reactions and the compounds, we can conclude the following matches: (a) Coupling reaction: (q) Aniline (b) Liebermann's nitroso reaction: (p) Phenol, (q) Aniline (c) Hinsberg reaction: (q) Aniline, (r) N-methylethanamine, (s) Tertiary butyl amine (d) Carbylamine reaction: (q) Aniline