Question

Primary amine on reaction with Grignard reagent gives which of the following?

• A. An alkane
• B. A higher amine
• C. A secondary amine
• D. None of these

Hint:

Grignard reagents liberate alkanes from any compound with acidic hydrogen (e.g., water, alcohols, amines).

Answer 1

The Correct Option is A

Step 1: Recall reaction type.
Grignard reagents (RMgX) are strong bases and react with acidic hydrogens. Primary amines (RNH$_2$) contain –NH hydrogen.
Step 2: Reaction.
RNH$_2$ + RMgX \(\rightarrow\) R–MgNH + RH.
Thus, an alkane (RH) is formed.
Step 3: Eliminate options.
- Higher amine: Not possible.
- Secondary amine: Not formed.
- None of these: Incorrect.
Step 4: Conclusion.
Thus, the correct product is an alkane.