The formation of cyanohydrin from a ketone is an example of

Given below are two statements $:$
Statement $(I) :$ Vanillin,with the structure shown below,will react with $NaOH$ and also with Tollen's reagent.
Statement $(II) :$ Vanillin will undergo self-aldol condensation very easily.
In the light of the above statements,choose the most appropriate answer from the options given below $:$

In the reaction
$Phenol$ $\xrightarrow[\text{Reimer-Tiemann}]{} X$ $\xrightarrow[(ii) H^+]{(i) NaOH \text{ (conc.)}} Z$
Product $Z$ is

Aldehydes that do not undergo aldol condensation are:
$1$. $CH_3CH_2CHO$ (propanal)
$2$. $Cl_3CCHO$ (trichloroethanal)
$3$. $HCHO$ (methanal)
$4$. $CH_3CHO$ (ethanal)
$5$. $C_6H_5CHO$ (benzaldehyde)

Among the following,the marked proton of which compound shows the lowest $pK_{a}$ value?

Match the List-$I$ with List-$II$.

List-$I$ (Reagents)	List-$II$ (Reaction Name)
$A$. $NH_2-NH_2, KOH$	$I$. Tollen's Test
$B$. $[Ag(NH_3)_2]OH$	$II$. Clemmensen Reduction
$C$. Aq. $CuSO_4$, Sodium Potassium tartarate, $KOH$	$III$. Wolff-Kishner Reduction
$D$. $Zn-Hg, HCl$	$IV$. Fehling's Test

Choose the correct answer from the options given below: