Identify the reagent(s) '$\mathrm{A}$' and condition(s) for the reaction :

• A

  $\mathrm{A}=\mathrm{HCl}$; Anhydrous ${\mathrm{AlCl}}_3$
• B

  $\mathrm{A}=\mathrm{HCl},{\mathrm{ZnCl}}_2$
• Correct answer
  C

  $\mathrm{A}={\mathrm{Cl}}_2$; $\mathrm{UV}$ light
• D

  $\mathrm{A}={\mathrm{Cl}}_2$; dark, Anhydrous ${\mathrm{AlCl}}_3$

Hence, the correct answer is option: 'C'.