15. Build two different models of 2-butene. This is a four-carbon chain with a double bond between carbons 2 and 3. a. These two models are stereoisomers. What is their relationship? Enantiomers, diastereomers, something else? b. Classify the two models as cis- and trans-

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Q: 25. Assign the chiral centers as R or S. OH „NH2

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Q: arent constitutional isomers, stereoisomers, and enantiomers basically the same thing?

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