Q. The major product of the following reaction is: $\mathrm{CH_3CH_2CH=O}\xrightarrow[\text{reflux}]{\text{excess HCHO, alkali}}$ ?
A) [image:2025J23S1_Q63_opt_a.png]
B) [image:2025J23S1_Q63_opt_b.png]
C) [image:2025J23S1_Q63_opt_c.png]
D) [image:2025J23S1_Q63_opt_d.png]
Explanation
[Solution by Dr. Abubacker] Propanal has two α-hydrogens, which undergo three successive aldol additions with excess formaldehyde to give CH₃C(CH₂OH)₂CHO. This has no α-hydrogen, so it undergoes a crossed Cannizzaro reaction with HCHO (which is oxidised to formate) to give the triol CH₃C(CH₂OH)₃ (option 1). Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.