91- 6303239042
$$\text{C}_6\text{H}_6 + \text{R--COCl} \xrightarrow{\text{Anhy. AlCl}_3} \text{C}_6\text{H}_5\text{--CO--R} + \text{HCl}$$
Electrophile: Acylium ion ($$\text{R--C}\equiv\text{O}^+$$); highly stable via resonance, no carbocation rearrangement occurs.
