An organic compound $'A'$ has a molecular formula $C_{2}H_{6}O$. $'A'$ on oxidation gives compound $'B'$,which produces effervescence with baking soda.
$(i)$ Identify $'A'$ and $'B'$.
$(ii)$ Write the chemical reaction of $'B'$ with baking soda.

(A) $(i)$ $'A'$ is Ethanol $(CH_{3}CH_{2}OH)$ and $'B'$ is Ethanoic acid $(CH_{3}COOH)$.
$(ii)$ The reaction of Ethanoic acid with baking soda $(NaHCO_{3})$ is:
$CH_{3}COOH + NaHCO_{3} \longrightarrow CH_{3}COONa + CO_{2} \uparrow + H_{2}O$
This reaction releases carbon dioxide gas,which causes the observed effervescence.