Exercise 1

A mixture of benzaldehyde and formaldehyde, on heating with aqueous $\mathrm{NaOH}$ solution, gives:

In the conversion of $2$ -butanone to propanoic acid, which reagent is used?

In the following reaction:

${\left({\mathrm{CH}}_3\right)}_2\mathrm{CO}\underset{{\mathrm{H}}_2\mathrm{O}}{\overset{\mathrm{Mg}-\mathrm{Hg}}{\to }}\mathrm{A}\stackrel{{\mathrm{H}}^{+},\mathrm{\Delta }}{⟶}\mathrm{B}$,
$\mathrm{A}$ and $\mathrm{B}$ are, respectively:

In which of the following reaction the final product is neither an acid nor an acid salt?

The major products of the following reaction are: 

A mixture of two aromatic compounds $\mathrm{A}$ and $\mathrm{B}$ when dissolve in $\mathrm{NaOH}, \mathrm{A}$ is soluble and its residue $\mathrm{B}$ gives $2, 4$ $\mathrm{DNP}$ test, identify compounds $\mathrm{A}$ and $\mathrm{B}.$

${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{CONH}}_2$ is boiled with aqueous $\mathrm{NaOH}$, then the reaction mixture is acidified with $\mathrm{HCl}$. The products obtained are