What will be the product of the following reaction?

Treatment of propionaldehyde with dil. $NaOH$ gives:

What is the product formed when acetone reacts with $I_2$ in the presence of $NaOH$?

Which of the following represents the major product for the given reaction?

The reaction $CH_3CHO \xrightarrow[Zn(Hg) / \text{Conc. } HCl]{[H]} CH_3CH_3$ is:

$A$ compound having molecular formula $C_3H_6O$,on reaction with $NH_2NHCONH_2$ produces mainly $P$ (which shows stereoisomerism). $P$ on reaction with $KOH$ / ethylene glycol,$\Delta$ produces propane. Identify $(P)$.