Aldehyde And Ketone

The increasing order of boiling points of 5 compounds having comparable molar masses is as follows:
Methoxyethane $<$ Propanone $<$ Propanal $<$ Propan-1-ol

During nucleophilic addition of HCN to RCHO , the hybridisation changes from $\mathrm{sp}^2$ to $\mathrm{sp}^3$ and a tetrahedral intermediate is formed.

Acetone undergoes Wolff Kishner reaction to yield Propane.

The order of reactivity towards Nucleophilic attack is Methanal $>$ Di-tert.butyl ketone $>$ Benzaldehyde $>$ Acetophenone