A dibromo derivative of an alkane reacts with sodium metal to form an alicyclic hydrocarbon. The derivative is ______.
2, 2–dibromobutane
1, 1–dibromopropane
1, 4–dibromobutane
1, 2–dibromoethane
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One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of 44 u. The alkene is