What happens when: $(i)$ ethanol is burnt in air and $(ii)$ it is oxidized? Write the corresponding reaction equations.

(N/A) $(i)$ When ethanol is burnt in air,it undergoes combustion to produce carbon dioxide,water,and energy.
$CH_{3}CH_{2}OH + 3O_{2} \longrightarrow 2CO_{2} + 3H_{2}O + \text{Energy}$
$(ii)$ When ethanol is oxidized using oxidizing agents like alkaline $KMnO_{4}$ or acidified $K_{2}Cr_{2}O_{7}$,it is converted into ethanoic acid.
$CH_{3}CH_{2}OH \xrightarrow[\text{Acidified } K_{2}Cr_{2}O_{7}]{\text{Alkaline } KMnO_{4}} CH_{3}COOH$