Complete the following reactions.
i) CH3 CH2 OH \(\overset{Con.H_2SO^4}{\underset{Heat}{\longrightarrow}}\)CH2 = CH2 + H2O
ii) CH3 COOH + NaHCO3→ CH3 COONa + H2O + CO2
iii) CH4 + Cl2 \(\overset{Sunlight}{\underset{}{\longrightarrow}}\)CH3 Cl + HCl
iv) CH2 = CH2 + H2 \(\overset{Ni}{\underset{}{\longrightarrow}}\)CH3 - CH3