Q. Three of the following four reactions are due to one similar feature of carbonyl compounds, while the fourth one is different. Which one is fourth?
A) Aldol condensation
B) Knoevenagel reaction
C) Witting reaction
D) Haloform reaction
Explanation
(c)
Aldol condensation, haloform reaction and knovengel reaction involve the formation of a resonance stabilised anion, while the Wittig reaction involves the addition of a nucleophile on the carbonyl carbon. The driving force for the Wittig reaction is the formation of a very strong $P - O$ bond
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.