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A and B in the following reactions are R—C≡N →(HCN/KCN)→ A →(B)→ R—C—OH OH CH2NH2

1. (a) A = RR'C—CN, B = LiAlH4
2. (b) A = RR'C—COOH, B = NH3
3. (c) A = RR'C—CN, B = H3O+
4. (d) A = RR'C—CN, B = NaOH

Correct answer: (c) A = RR'C—CN, B = H3O+

Solution

In the first step, the reaction of R—C≡N with HCN/KCN forms a cyanohydrin (A = RR'C—CN). In the second step, hydrolysis with H3O+ converts the cyanide group to a carboxylic acid, forming R—C—OH (with OH and CH2NH2 groups).

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