Carbonyl Compounds Questions

Reaction of cyclohexanone with dimethylamine in the presence of catalytic amount of an acid forms a compound if water during the reaction is continuously removed. The compound formed is generally known as:

The increasing order of the rate of $\text{HCN}$ addition to compounds A – D is:(A) $\text{HCHO}$ (B) ${\text{CH}}_3{\text{COCH}}_3$ (C) ${\text{PhCOCH}}_3$ (D) $\text{PhCOPh}$

In the Cannizzaro reaction: $2\text{PhCHO}\stackrel{:{\text{OH}}^{-}}{\to }{\text{PhCH}}_2\text{OH}+{\text{PhCOO}}^{-}$, the slowest step is:

In the transformation of 4-hydroxy-2-butanone to 4-hydroxybutane (reduction of carbonyl to methylene), which of the following is the most appropriate reagent?