Question

R-NH\(_2\) and HNO\(_2\) react to form:

• A. \( R-R \)
• B. \( R-OH \)
• C. \( R \to NH \)
• D. \( NH_3 \)

Hint:

Nitrous acid is used in diazotization reactions. When primary amines react with \( HNO_2 \), they form alcohols or nitrogen gas, depending on conditions.

Answer 1

The Correct Option is D

Step 1: Understanding the Reaction When a primary amine (\( R-NH_2 \)) reacts with nitrous acid (\( HNO_2 \)), it undergoes deamination, producing nitrogen gas (\( N_2 \)) or ammonia (\( NH_3 \)), depending on the conditions. \[ R-NH_2 + HNO_2 \rightarrow R-OH + N_2 + H_2O \] Step 2: Special Case - Ammonia Formation When the amine group is part of an ammonium salt (\( NH_4^+ \)), ammonia gas (\( NH_3 \)) is released. \[ NH_4^+ + HNO_2 \rightarrow NH_3 + H_2O + N_2 \] Thus, the correct answer is \( NH_3 \).