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A sweet smelling liquid A has molecular formula C_5 H_(10) O_2 A does not change colour of moistened litmus paper but on acid hyrolysis produces two fragments B and C. B gives effervescence with aqueous NaHCO_3 but 'C' does not 'C' on treatment with PCl_5 gives an alkyl chloride 'D' 'D' on dissolving in Etheral solution of Mg and passing CO_2 through this solution and finally acidifying product with HCl gave B. Identify A to D.

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