Question

write the name of regent used during conversion of acetaldehyde to acetaldehyde cyanohydrin
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Answer 1

The reagent used during conversion of acetaldehyde to acetaldehyde cyanohydrin is Hydrogen Cyanide (HCN).

Explanation:

1.Hydrogen Cyanide gets added to acetaldehyde to form acetaldehyde cyanohydrine.
2.The reaction with pure cyanohydrin is slow as a result of which a base is added to catalyse the reaction.
3.In presence of base, the generated cyanide ion (CN⁻) being a strong nucleophile gets added to the electrophilic carbon of the carbonyl group of aldehyde.
4.The addition of cyanide to the electrophilic carbon results in the fomation of a negetive charge over oxygen atom of carbonyl group. The negetive charge over oxygen picks up hydrogen ion from another hydrogen cyanide molecule or from water molecule as well resulting in the formation of the corresponding cyanohydrine.

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Answer 2

The name of regent used during conversion of acetaldehyde to acetaldehyde cyanohydrin is Hydrogen cyanide (HCN).

Explanation:

Acetaldehyde in reaction with hydrogen cyanide gives acetaldehyde cyanohydrins.

It is an addition reaction.

$CH_3 - CHO + HCN \rightarrow CH_3 - CH_2 - CN$