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Olympiad workbookNSECHaloalkanes and Haloarenes

An alkyl halide ( X ) on reaction with ethanolic sodium hydroxide forms an alkene ( Y ) which on further reaction with HBr gives the same alkyl halide. The alkene ( Y ) on reaction with HBr /peroxide followed by reaction with Mg metal followed by reaction with HCN produces an aldehyde ( Z ). Z is

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