Exhibit 19-2 Consider the Data Below to Answer the Following Question(s)

question 31

Essay

Exhibit 19-2
Consider the data below to answer the following question(s).
Cyanohydrins are important intermediates in the synthesis of α-hydroxycarboxylic acids from ketones and aldehydes.The nitrile functional group can be hydrolyzed by aqueous acid to yield a carboxylic acid.Nitriles can also be hydrolyzed to carboxylic acids using aqueous base.Unfortunately,when a cyanohydrin is treated with aqueous base the original carbonyl compound is isolated.
-Refer to Exhibit 19-2.The reaction of benzaldehyde with hydrogen cyanide is catalyzed by the addition of a small amount of KCN.Write the complete reaction mechanism for the KCN-catalyzed reaction.Show all electron flow with arrows and show all intermediate structures.

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