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Q 2677280186.     An alcohol A, when heated with cone. `H_2SO_4` gives an alkene B. When B is bubbled through bromine water and the product obtained is dehydrohalogenated with excess of sodamide, a new compound C is obtained. The compound C gives D when treated with warm dilute `H_2SO_4` in presence of `HgSO_4` . D can also be obtained either by oxidising A with `KMnO_4` or from acetic acid through its calcium salt. Identify A, B, C and D.
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