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Which reaction represents the addition of hydrogen cyanide to acetaldehyde, forming a product with a chiral carbon?

1. CH3-CHO + HCN → CH3-CH(OH)-CN
2. CH3-CH(OH)-COOH
3. Reaction with water
4. 2-Hydroxypropanoic acid

Correct answer: CH3-CHO + HCN → CH3-CH(OH)-CN

Solution

The reaction starts with the addition of HCN to CH3-C=O, forming CH3-C-OH-CN. This is the first step in the sequence described.

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