Why does pure HCN fail to react with aldehydes and ketones ?

In aldehydes and ketones

Aldehydes and ketones are

Aldehyde and ketones are

Aldehyde and ketones are

Statement 1: NaHSO_3 involves protonation for the formation of stable species on reaction with aldehyde and ketones Statement 2: HCN +aldehyde/Ketone give amide

Preparation of Aldehydes and Ketones