Hydrocarbons (Alkyne Reduction Stereochemistry)

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ChemistryHydrocarbons (Alkyne Reduction Stereochemistry)

Ph-C(triple bond)C-Me is treated with Na/liq. NH3 to give L, and separately with H2 over Lindlar's catalyst (Pd/C) to give K. L then reacts with HBr in the presence of benzoyl peroxide to give N, while K reacts with HBr to give M. Choose the correct option:

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