Question

Identify the product obtained when nitro alkanes are treated with Sn / HCl.

• A. \(\text{R-NH}_{2}\)
• B. \(\text{R}_{2}\text{NH}\)
• C. \(\text{R}_{3}\text{N}\)
• D. \(\text{R}_{4}\text{N}^{+}\text{X}^{-}\)

Hint:

Sn/HCl is a reducing agent that converts the nitro group fully to an amino group.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept
Sn with HCl gives nascent hydrogen, which is a strong reducing agent for the nitro group.

Step 2: Reaction
\(\text{R-NO}_{2}+6[\text{H}]\xrightarrow{\text{Sn/HCl}}\text{R-NH}_{2}+2\text{H}_{2}\text{O}\)
Nitrogen stays bonded to the same single alkyl group.

Step 3: Conclusion
The product is a primary amine, not a secondary, tertiary or quaternary one.

Final Answer:
Nitroalkanes on reduction with Sn/HCl give primary amines, option (A). \[ \boxed{\text{(A) }\text{R-NH}_{2}} \]