(Answered) A certain sample was analyzed by proton nmr and found to

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A certain sample was analyzed by proton NMR and found to consist of three isomeric lactones (lactone Ahas a boiling point of 173°C; lactone B has a boiling point of 143°C; lactone C has a boiling point of 185°C). Rank these compounds in order of relative GC retention times (longest retention time first).

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