Complete the following reactions and identify $A, B, C$ respectively:
$(i)$ $\text{Phenol} + A \xrightarrow{\text{distill}} \text{Benzene}$
(ii) $\text{Benzenesulfonic acid} + B \xrightarrow{150-200^{\circ}C, \text{HCl, high pressure}} \text{Benzene}$
(iii) $\text{Chlorobenzene} \xrightarrow{C, \text{NaOH}} \text{Benzene}$

• A
  $A = Ni, B = H_2O \ (\text{liquid}), C = H_2O$
• B
  $A = Zn, B = H_2O \ (\text{steam}), C = H_2 \ (Ni-Al \ \text{alloy})$
• C
  $A = Mg, B = H_2O \ (\text{liquid}), C = HCl$
• D
  $A = Zn, B = H_2O \ (\text{boiling}), C = SnCl_2$