Ethanal undergoes reaction with KCN dissolved in liquid HCN. An intermediate is formed during this reaction. Which statement is correct?
- AHCN does not have any lone pairs of electrons and so $ ext{CN}^-$ is the catalyst.
- BThe $ ext{O}^-$ of $ ext{C}= ext{O}$ attacks $ ext{K}^+$ in a nucleophilic attack.
- CA proton from HCN is transferred to the intermediate.
- DThe reaction is a nucleophilic substitution.