2. Provide an explanation (using the relevant chair conformation) to rationalize the following: OTS Sinan tBuOK no elimination product H 3. Determine if the following pairs of molecules are enantiomers, diastereomers, constitutional isomers or the same molecule. Label each chiral center as Ror S. HO H CH, CHE A B. H2C1 CN CN Br RICH Br HO