Give balanced chemical equation for the following conversions :

(a) Copper sulphate to inky blue solution

(b) Methane to chloroform

(a)

$\text{Cu(OH)}$2 + (\text{NH}4)2\text{SO}4 + 2\text{NH}4\text{OH} \longrightarrow \underset{\underset{\text{copper (II) sulphate}}{\text{Tetraammine}}}{[(\text{Cu(NH}3)4]\text{SO}4} + 4\text{H}_2\text{O}

(b)

$\underset{\text{ methane} }{\text{CH}$4} + \text{Cl}2 \underset{\Delta}{\xrightarrow{\text{diffused sunlight}}} \underset{\text{monochloromethane}}{\text{CH}_3\text{Cl}} + \text{HCl}

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

$\underset{\text{dichloromethane}}{\text{CH}$2\text{Cl}2} + \text{Cl}2 \longrightarrow \underset{\text{trichloromethane or chloroform}}{\text{CHCl}3}+ \text{HCl}