NEETChemistryAldehydes and Ketones
Match List-I with List-II regarding the reactions of acetaldehyde cyanohydrin. List-I (Reagents) List-II (Major Products) (A) dil. HCl / (I) Prop-2-enoic acid (B) conc. H ₂ SO ₄ / strong heat (II) 2-Hydroxypropanamide (C) LiAlH ₄ (III) 2-Hydroxypropanoic acid (D) H ₂ O ₂ / OH ⁻ (IV) 1-Aminopropan-2-ol Choose the correct answer from the options given below:
Options
- A(A)-(III), (B)-(I), (C)-(IV), (D)-(II)
- B(A)-(I), (B)-(III), (C)-(IV), (D)-(II)
- C(A)-(III), (B)-(I), (C)-(II), (D)-(IV)
- D(A)-(II), (B)-(I), (C)-(IV), (D)-(III)
Correct answer
A. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
Step-by-step solution
Acetaldehyde cyanohydrin is CH ₃ CH(OH)CN . (A) With dil. HCl and heat, complete hydrolysis of the nitrile group occurs without dehydration, yielding 2-hydroxypropanoic acid ( CH ₃ CH(OH)COOH ). (B) With conc. H ₂ SO ₄ and strong heat, the nitrile undergoes hydrolysis and the alcohol undergoes dehydration, yielding prop-2-enoic acid ( CH ₂ =CHCOOH ). (C) LiAlH ₄ reduces the nitrile group to a primary amine, yielding 1-aminopropan-2-ol ( CH ₃ CH(OH)CH ₂ NH ₂ ). (D) H ₂ O ₂ in weakly alkaline medium ( OH ⁻ ) causes p