Problem: For each of the pairs shown below, give the best answer which describes the relationship between each molecule in the pair. Choose from one of the four following: (a) constitutional isomers; (b) different conformations of the same compound; (c) stereoisomers that cannot be interconverted by rotation about single bonds; or (d) the same conformation of the same compound. In part a through part d of this problem, a letter may be used more than once, or it may not be used at all.

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For each of the pairs shown below, give the best answer which describes the relationship between each molecule in the pair. Choose from one of the four following: (a) constitutional isomers; (b) different conformations of the same compound; (c) stereoisomers that cannot be interconverted by rotation about single bonds; or (d) the same conformation of the same compound. In part a through part d of this problem, a letter may be used more than once, or it may not be used at all.