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Question:

Pyruvic acid is obtained by: oxidation of acetaldehyde cyanohydrin, oxidation of formaldehyde cyanohydrin, oxidation of acetone cyanohydrin, None of the above

None of the above

oxidation of acetaldehyde cyanohydrin

oxidation of formaldehyde cyanohydrin

oxidation of acetone cyanohydrin

Solution:

Acetaldehyde with HCN gives acetaldehyde cyanohydrin
CH3CHO+HCN → CH3CH(CN)-OH
on oxidation it gives,
CH3CH(CN)-OH → CH3CH(OH)-COOH
CH3CH(OH)-COOH → CH3C(COOH)=O
gives pyruvic acid.