Shown below are Fischer projection formulas for (R,R)-, (S,S)-, and (R,S)-2,3-dichlorobutane. (a) Which is which? (b) Which formula is a meso compound CH3 CH3 CH3 CH3 CH3

(R)-Lyrica has an optical rotation of -128 degrees in acetone solution and it's crystals have a melting point of +184 degrees celsius. It's enantiomer, (S)-Lyrica, would have an optical rotation of ______ and a melting point of _____?

Using only C, H, and O, write structural formulas for the lowest-molecular-weight chiral. Q) Alkane

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ITEM #5 (Everyone should look at this question). Consider the two Fischer projections shown at right. They CH CH are NOT of the same molecule. H- -HO- HO In a short paragraph, explain why the molecules shown are NOT the same. OH но- H. HO. но In your explanation, describe how the groups of a Fischer projection are positioned in the ACTUAL molecule (Are the molecules flat in real life, or three-dimensional in real life? If three-dimensional, where exactly are the Hs and OHs positioned when one interprets these projections?) H- HO но H- CH,OH ČH;OH Also in your explanation, describe why the second molecule is not simply the first molecule flipped over (like a pancake).

(a) Identify type of molecules either chiral, achiral, or meso for each compound shown below and (b) Indicate the number of chiral centers in each molecule.

Determine the configuration of each stereogenic center in the compound below. Highlight the carbon in red if the configuration is R, and in blue if the configuration is S. OH O.

Draw a structural formula of the SR configuration of the compound shown below. HO CH3 S -NHCH3 R H3C ephedrine • Use the wedge/hash bond tools to indicate stereochemistry where it exists. • Include H atoms at chiral centers only. • If a group is achiral, do not use wedged or hashed bonds on it. * #[ ] در ?

3. Draw all possible stereoisomers for the following molecule. Once drawn, assign the configuration at each chiral center as R or S. Give the relationship between each stereoisomer that was drawn as enantiomers, diastereomers, or meso compound. You build a table to give the relationship between each stereoisomer. may SH