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- Which of the following structures represent the same stereoisomer? A. only 1 and 2 B. only 1 and 3 C. only 2 and 3 D. 1, 2 and 3 Please explain.How many possible stereoisomers?Are the following constitutional isomers, conformers, or stereoisomers. If they are stereoisomers, are they enantiomers or diostereoemrs?