Final answer:
The reagent commonly used to achieve the formation of an epoxide from benzene is MCPBA.
Step-by-step explanation:
The reagent commonly used to achieve the formation of an epoxide from benzene is (C) MCPBA.
Epoxides can be formed from alkenes or aromatic compounds through reactions with peroxyacids. MCPBA, or meta-chloroperoxybenzoic acid, is a commonly used peroxyacid that can react with benzene to form an epoxide.
Here is the balanced reaction:
b. C₆H₆ + MCPBA → Epoxide