Which of the following is an example of electrophilic substitution reaction?

• A

  $\mathrm{CH}_3 \mathrm{CHO}+\mathrm{HCN} \rightarrow \mathrm{CH}_3 \mathrm{CH}(\mathrm{OH}) \mathrm{CN}$
• B

  $\left(\mathrm{CH}_3\right)_3 \mathrm{CX}+\mathrm{H}_2 \mathrm{O} \rightarrow\left(\mathrm{CH}_3\right)_3 \mathrm{C}-\mathrm{OH}+\mathrm{HX}$
• Correct answer
  C

  $\mathrm{C}_6 \mathrm{H}_6+\mathrm{CH}_3 \mathrm{COCl} \xrightarrow{\mathrm{AlCl}_3} \mathrm{C}_6 \mathrm{H}_5\left(\mathrm{COCH}_3\right)+\mathrm{HCl}$
• D

  $\mathrm{Br} \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{Br}+\mathrm{Zn} \xrightarrow[\Delta]{\text { alcohol }} \mathrm{CH}_2=\mathrm{CH}_2+\mathrm{ZnBr}_2$

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