The aldehyde which reacts with $NaOH$ to produce an alcohol and sodium salt is

Which of the following compounds gives $2HCHO, CO_2, HCO_2H$ when oxidized by periodic acid $(HIO_4)$?

An optically active alkyl bromide $C_4H_9Br$ reacts with ethanolic $KOH$ to form major compound $[A]$, which reacts with bromine to give compound $[B]$. Compound $[B]$ reacts with ethanolic $KOH$ and sodamide to give compound $[C]$. One molecule of water adds to compound $[C]$ on warming with mercuric sulphate and dilute sulphuric acid at $333 \text{ K}$ to form compound $[D]$. The functional group in compound $[D]$ will be confirmed by:

Which of the following compounds undergo Cannizzaro reaction?
$(a)$ $HCHO$
$(b)$ $C_6H_5-CHO$
$(c)$ $CH_3-C(CH_3)_2-CHO$
$(d)$ $Ph-CH_2-CHO$

Carbonyl compounds can generally be converted to hydrocarbons by

What will be the order of reactivity of the following carbonyl compounds with a nucleophile?
$(I)$ $HCHO$
$(II)$ $CH_3CHO$
$(III)$ $(CH_3)_2CO$
$(IV)$ $(Me_3C)_2CO$