When an excess of benzene reacts with dichloromethane () in the presence of anhydrous , diphenylmeth — Aromatic Hydrocarbons Chemistry Question
Question
When an excess of benzene reacts with dichloromethane ($CH_2Cl_2$) in the presence of anhydrous $AlCl_3$, diphenylmethane is formed as the main product. How many distinct benzene rings are present in one molecule of diphenylmethane?
Answer: 2
💡 Solution & Explanation
Dichloromethane has two leaving groups (chlorine atoms). Under Friedel-Crafts conditions, it sequentially alkylates two separate benzene rings. The resulting product is diphenylmethane ($Ph-CH_2-Ph$), which contains exactly 2 benzene rings joined by a methylene bridge.
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