(a) State the condition required for the following reactions.

(1) Conversion of methyl chloride to dichloromethane.

(2) Conversion of ethanol to ethene.

(b) Give the reaction involved in the formation of methyl acetate (ester).

(a) (1) methyl chloride converts to dichloromethane under diffused sunlight, ultraviolet light or high temperature [400°C]

$\underset{\text{methylchloride} }{\text{CH}$3\text{Cl}} + \underset{\text{[excess]}}{\text{Cl}2} \longrightarrow \underset{\text{dichloromethane}}{\text{C}\text{H}2\text{Cl}2}+ \text{HCl}

(2) By heating ethyl alcohol with concentrated H₂SO₄ at 170°C.

$\underset{\text{ ethyl alcohol}}{\text{C}$2\text{H}5\text{OH}} \xrightarrow[170\degree\text{C}]{\text{Conc. H}2\text{SO}4\text{[excess]}} \underset{ \text{ethene}}{\text{C}2\text{H}4} + \text{H}_2\text{O}\

(b)

$\underset{\text{methyl alcohol}}{\text{CH}$3\text{OH}} + \underset{\text{acetic acid}}{\text{CH}3\text{COOH}} \xrightarrow{\text{Conc. H}2\text{SO}4} \underset{\text{methyl acetate}}{\text{CH}3-\text{COO}-\text{CH}3} + \text{H}_2\text{O}