$NaOH/H^{+}$ reacts with:

In a set of reactions,an acid yielded a product $D$.
$CH_3COOH$ $\xrightarrow{SOCl_2} A$ $\xrightarrow[Anhyd. AlCl_3]{Benzene} B$ $\xrightarrow{HCN} C$ $\xrightarrow{H_3O^+} D$
Identify the product $D$.

The major product formed in the following reaction is:

Identify the final product in the following reaction sequence: $R-CHO$ $\xrightarrow{HS-(CH_2)_3-SH}$ $\xrightarrow{n-BuLi}$ $\xrightarrow{D_2O}$ $\xrightarrow{HgCl_2/CdCO_3, H_2O} \text{Product}$

When ethanal reacts with $CH_3MgBr$ and $C_2H_5OH$/dry $HCl$,the products formed are

In the following reaction sequence,the product $D$ is:
$CH_3COOH$ $\xrightarrow{SOCl_2} A$ $\xrightarrow[AlCl_3]{C_6H_6} B$ $\xrightarrow{HCN} C$ $\xrightarrow{H_2O} D$