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Explanation:
In first question, elimination reaction (E2 mechanism) will take place.Reactant is dehydrohalogenated,and we get Saytzeff(most substituted alkene) product as the major one.So, major product is but-2-ene.A minor product(Hoffman product) but-1-ene is also formed.
In second question,we get a vicinal diol.Product is propan-1,2-diol.
Third question is an example of Wurtz reaction.This is a type of step of step up reaction, usually works for alkanes having even number of carbon atoms.So, product is ethane.
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