Write balanced equations for the following reactions:

(a) Preparation of ethyne from ethylene dibromide.

(b) Preparation of ester using carboxylic acid.

(c) Conversion of alkyl halide to ethene.

(a)

(b) $\underset{\text{ethyl alcohol}}{\text{C}$2\text{H}5\text{OH}} + \underset{\text{acetic acid}}{\text{CH}3\text{COOH}} \xrightarrow{\text{Conc. H}2\text{SO}4} \underset{\text{ethyl acetate}}{\text{CH}3-\text{COO}-\text{C}2\text{H}5} + \text{H}_2\text{O}

(c)

$\underset{\text{ Chloroethane [ethyl chloride]}}{\text{C}$2\text{H}5\text{-Cl}} + \underset{\text{ alcoholic KOH}}{\text{KOH [aq.]}} \xrightarrow{\text{boil}} \underset{\text{ Ethene [ethylene]} }{\text{C}2\text{H}4} + \text{KCl} +\text{H}_2\text{O}