Explain the following reactions with chemical equations:
$(i)$ Oxidation
$(ii)$ Hydrogenation
$(iii)$ Substitution

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(N/A) $(i)$ Oxidation: Alcohols are converted into carboxylic acids in the presence of an oxidizing agent such as acidified $K_2Cr_2O_7$.
$CH_3CH_2OH \xrightarrow[Acidified]{K_2Cr_2O_7} CH_3COOH$
$(ii)$ Hydrogenation: Unsaturated hydrocarbons (like ethene) react with hydrogen in the presence of a catalyst like $Ni$ or $Pd$ to form saturated hydrocarbons.
$CH_2 = CH_2 + H_2 \xrightarrow[\Delta]{Ni} CH_3 - CH_3$
$(iii)$ Substitution: Saturated hydrocarbons (like methane) react with chlorine in the presence of sunlight to form chloroalkanes.
$CH_4 + Cl_2 \xrightarrow{Sunlight} CH_3Cl + HCl$

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Match the reactions given in Column $(A)$ with the names given in Column $(B).$
Column $(A)$ Column $(B)$
$(a)$ $CH_{3}OH + CH_{3}COOH \xrightarrow{H^{+}} CH_{3}COOCH_{3} + H_{2}O$$(i)$ Addition reaction
$(b)$ $CH_{2}=CH_{2} + H_{2} \xrightarrow{Ni} CH_{3}-CH_{3}$$(ii)$ Substitution reaction
$(c)$ $CH_{4} + Cl_{2} \xrightarrow{\text{Sunlight}} CH_{3}Cl + HCl$$(iii)$ Neutralisation reaction
$(d)$ $CH_{3}COOH + NaOH \longrightarrow CH_{3}COONa + H_{2}O$$(iv)$ Esterification reaction

Which of the following is the correct representation of the electron dot structure of nitrogen $(N_2)$?

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