The compound obtained by the reduction of propionaldehyde by amalgamated zinc and concentrated $HCl$ is

Arrange the following compounds in decreasing order of reactivity towards nucleophilic addition reaction:
$I: HCHO$
$II: CH_3CHO$
$III: CH_3COCH_3$
$IV: PhCOCH_3$

Which one of the following is produced when acetone is saturated with $HCl$ gas?

Which of the following reagents can be used to reduce the $ > C = O$ group to $CH_2$?

The structure of $(B)$ is:

The smallest ketone and its next homologue are reacted with $NH_2OH$ to form oximes.