alleryA reaction of an aldehyde with ammonia followed by a primary amine R-NH₂ gives:
ASchiff base (substituted imine: R-CH=N-R')
BHemiacetal
CAcetal
DCarboxylic acid
Answer & Solution
Correct answer: A. Schiff base (substituted imine: R-CH=N-R')
**RCHO + R'NH₂ → R-CH=N-R' (Schiff base / substituted imine) + H₂O**.
With **NH₃** alone → imine R-CH=NH
with **hydroxylamine NH₂OH**
→ oxime; with **hydrazine NH₂NH₂**
→ hydrazone; with **2,4-DNP**
→ 2,4-DNP hydrazone.
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