When the epoxide 2-vinyloxirane reacts with lithium dibutylcuprate, followed by protonolysis, a compound A is the major product formed. Oxidation of A with PCC yields B, a compound that gives a positive Tollens test and has an intense UV absorption around 215 nm. Treatment of B with Ag₂O, followed by catalytic hydrogenation, gives octanoic acid. Identify A and B, and outline a mechanism for the formation of A.

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H₂C=CH-C-CH₂ H 2-vinyloxirane