How will you convert ethanol to ethanoic acid?

How will you convert bromoethane into ethanoic acid?

$\mathrm{Zn}\left(\mathrm{Hg}\right)/\mathrm{Conc}. \mathrm{HCl}$ is used for reducing $\mathrm{RCHO}$ to ${\mathrm{RCH}}_3$ or $\mathrm{RCOR}$ to ${\mathrm{RCH}}_2\mathrm{R}$.

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

PCC is milder oxidant than that of acidified ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$.

${\mathrm{NaBH}}_4$ reduces alkynes to cis-alkenes.

Which reaction is not appropriate for the synthesis of the following?