The reaction of toluene with $\mathrm{Cl}_2$ in presence of $\mathrm{FeCl}_3$ gives ' $X$ ' and reaction in presence of light gives ' $Y$ '. Thus, ' $X$ ' and ' $Y$ ' are

• A

  $\mathrm{X}=$ Benzal chloride, $\mathrm{Y}=\mathrm{o}$-chlorotoluene
• B

  $\mathrm{X}=m$-chlorotoluene, $\mathrm{Y}=\mathrm{p}$-chlorotoluene
• Correct answer
  C

  $\mathrm{X}=a$-and $p$-chlorotoluene $\mathrm{Y}=$ trichloromethyl benzene
• D

  $\mathrm{X}=$ benzyl chloride, $\mathrm{Y}=$ m-chlorotoluene

Solution

Key Idea In the presence of halogen carrier, electrophilic substitution accurs while in the presence of sunlight, substitution accurs at the side chain.

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