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Cyanohydrin formation and decarboxylation
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The below product formed from the following reaction sequence is:
Benzaldehyde + HCN gives the cyanohydrin $C_6H_5CH(OH)CN$; acid hydrolysis gives $C_6H_5CH(OH)COOH$; heating with sodalime (NaOH + CaO, a decarboxylating reagent) removes $CO_2$ to give benzyl alcohol $C_6H_5CH_2OH$.