A Levels Chemistry (9701)•9701/12/O/N/20
Explanation
Reaction of organosodium with ammonium salts produces ammonia
Steps:
- Identify the test: Warming with aqueous NH4Cl produces alkaline gas (NH3) via acid-base reaction.
- Check each option for ability to act as a strong base or nucleophile to liberate NH3 from NH4+.
- Eliminate weak acids/alcohols/ketones that don't deprotonate NH4Cl effectively.
- Confirm organosodium compounds react vigorously to form alkane, NaCl, and NH3.
Why D is correct:
- CH3CH2Na, an organosodium, acts as a strong base: CH3CH2Na + NH4Cl → CH3CH3 + NaCl + NH3 (alkaline gas).
Why the others are wrong:
- A. CH3COOH is a weak acid, reacts with NH4Cl to form ammonium acetate, no gas.
- B. CH3CH2OH is neutral alcohol, no reaction with NH4Cl to produce gas.
- C. CH3COCH3 is neutral ketone, inert under these conditions, no gas evolved.
Final answer: D
Topic: Organic synthesis
Practice more A Levels Chemistry (9701) questions on mMCQ.me