Question

How does Acetaldehyde (CH3CHO) reacts with :(i) HCN
(ii) Hydrazine (NH2NH2)​

Answer 1

Answer:

acetaldehyde + hydrogen cyanide=acetic acid

Answer 2

Acetaldehyde reacts with the given compounds as follows:

(i) Acetaldehyde reacts with Hydrogen Cyanide (HCN) to form Acetaldehyde Cyanohydrin as follows:

CH3CHO + HCN ⇄ CH3-CH(OH)(CN)

- This reaction is very slow with pure HCN and thus a base is used as a catalyst.

- Cyanohydrins are very useful synthetic intermediates.

(ii) Acetaldehyde reacts with Hydrazine (NH2NH2) to form Acetaldehyde Hydrazone as follows:

CH3CHO + NH2NH2 ⇄ CH3-CH=N-NH2

- Acetaldehyde hydrazone is used in biological activities.