See image — Hydrocarbons Chemistry Question

💡 Solution & Explanation

Concept: MMPP (Magnesium monoperoxyphthalate) is a mild, selective peracid reagent used for epoxidation of alkenes. It reacts with carbon-carbon double bonds to form epoxides (oxiranes) via electrophilic oxygen transfer, analogous to mCPBA but safer and water-soluble. Step 1: Identify the starting material. The starting material is a bicyclic compound consisting of a cyclohexadiene ring fused with a cyclopentane ring — specifically a bicyclo system with two double bonds (resembling a partially unsaturated indane or hydrindane framework). Step 2: Reaction with MMPP. MMPP is a peracid epoxidation reagent. It selectively epoxidizes the more electron-rich or more accessible double bond. The reaction converts a C=C double bond into an epoxide (three-membered ring with oxygen). Step 3: Identify the product. The product should be an epoxide derived from the starting bicyclic diene. Option (b) shows the bicyclic structure (cyclohexene fused with cyclopentane) with an epoxide ring formed across one of the double bonds, giving a strained bicyclic epoxide. This is consistent with MMPP epoxidation of one double bond of the starting diene. Step 4: Why other options fail: - Option (a) shows a furan-type cyclic ether (THF-like ring), which would not be the direct product of peracid epoxidation; this would require further rearrangement under acidic conditions not present here. - Option (c) shows a diol with two OH groups on adjacent carbons — this is the product of osmium tetroxide (OsO4) dihydroxylation, not peracid epoxidation. - Option (d) shows a diol with OH groups at ring junctions — again consistent with dihydroxylation, not epoxidation, and placement at quaternary carbons is inconsistent with simple peracid epoxidation. MMPP in ethanol selectively epoxidizes the double bond to give the epoxide product shown in option (b). Therefore, the correct answer is B.