Question

Identify the amines exhibiting Diazotization reaction /orange dye test from following.

• A. \(2^{\circ }\) aliphatic amines
• B. \(1^{\circ }\) aliphatic amines
• C. \(1^{\circ }\) aromatic amines
• D. \(3^{\circ }\) aliphatic amines

Hint:

Only primary aromatic amines form stable diazonium salts that couple with 2-naphthol.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
Diazotization is the reaction of an amine with \(\text{NaNO}_{2}\) and \(\text{HCl}\) at \(0-5^{\circ}\text{C}\).

Step 2: Primary aromatic amines
They give stable arenediazonium salts, which couple with alkaline 2-naphthol to form an orange-red azo dye.

Step 3: Other amines
Primary aliphatic amines form unstable diazonium salts that decompose to give \(\text{N}_{2}\). Secondary and tertiary amines do not undergo diazotization.

Final Answer:
Primary aromatic amines show the diazotization and orange dye test. \[ \boxed{\text{(C) }1^{\circ}\text{ aromatic amines}} \]