4. Provide concise explanations for the following concepts. Structures can be used to aid your explanations. a. Racemic mixture b. Meso compound c. The difference between a chiral center and a stereocenter

4. Provide concise explanations for the following concepts. Structures can be used to aid your explanations. a. Racemic mixture b. Meso compound c. The difference between a chiral center and a stereocenter

Chemistry: Matter and Change

1st Edition

ISBN:9780078746376

Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Chapter21: Hydrocarbons

Section: Chapter Questions

Problem 66A

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Identify the stereocentres, if any, in the following structure. The carbon atoms have been numbered for easier identification. HHH III UN H H Note, sometimes stereocentres are informally called "chiral carbon atoms". Strictly, only entire molecules or objects are or are not chiral. 1) C1 2) C2 3) C3 EN 4) C4 5) None of the carbons is a stereocentre.
2. If a molecule has 3 asymmetric carbon centers, how many stereoisomers are there? Show work. ^.
Drawing optical isomers 1. Locate the chiral centre- look for the carbon atom with four different groups attached. 2. Draw one enantiomer in a tetrahedral shape -chlo 1. Loca - put the chiral carbon atom at the centre and the four different groups in a tetrahedral shape around it. Don't try to draw the full structure of each group -it gets confusing, Just use the structural formulas. 3. Draw the mirror image of the enantiomer-put in a mirror line next to the enantiomer and then draw the mirror image of the enantiomer on the other side of it. Example Draw the two enantiomers of 2-hydroxybutanoic acid. The structure of 2-butanoic acid is shown below. 1. Locate the chiral centre 2. Draw one 3. Draw its mirror image beside it. enantiomer in a 1. La tetrahedral shape H H H C.CH,CH ICOOH C*COOH chiral centre H H. OH H;CH,C I HOOC H;CH,C ОН OH ОН