$A$ carbonyl compound reacts with hydrogen cyanide $(HCN)$ to form cyanohydrin,which on hydrolysis forms a racemic mixture of $\alpha$-hydroxy acid. The carbonyl compound is:

Among the following,the number of compounds which will give positive iodoform reaction is:
$(a)$ $1-$Phenylbutan$-2-$one
$(b)$ $2-$Methylbutan$-2-$ol
$(c)$ $3-$Methylbutan$-2-$ol
$(d)$ $1-$Phenylethanol
$(e)$ $3,3-$dimethylbutan$-2-$one
$(f)$ $1-$Phenylpropan$-2-$ol

Acetaldehyde, when heated in the presence of sodium hydroxide and $I_2$, forms:

Predict the product in the given reaction:
$3-\text{chlorobenzaldehyde} \xrightarrow{50\% \text{KOH}, \Delta} ?$

$CH_3-CHO \xrightarrow{dil. OH^{-} / \Delta}$ Major product formed in the above reaction is:

Identify $A, B$,and $C$ in the following reactions:
Isopropyl chloride $\xrightarrow{NaOH} A$ $\xrightarrow{Cu/573 \ K} B$ $\xrightarrow{NaOI} C + \text{Iodoform}$