chm2210sex2ans

chm2210sex2ans - Organic Chemistry I CHM2210 Exam 2 Fall...

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Organic Chemistry I CHM2210 Exam 2 Fall 2006 KEY I. Fill in the Blanks (Each Blank = 1 Points) 1. A 50:50 mixture (by moles) of a pair of enantiomers is called a racemic mixture. 2. A compound has 3 chiral carbon atoms. What is the maximum possible number of stereoisomers this compound can have? 8 3. A mixture of enantiomers that contains a 50% enantiomeric excess (is 50% optically pure) of the (R) isomer, contains 75% or the R and 25% of the S forms. 4. Comparing isopropyl alcohol and 2-methyl-2-butanol, only 2-methyl-2-propanol contains a tertiary carbon atom. 5. (True/False) Single bonds between the atoms of cyclohexane are normally capable of free rotation. False 6. How many chiral carbons are in the compound β-cadinene. 3 7. The specific rotation [α] D 20 of a compound is a function of observed rotation, concentration, and path length. (Hint -The components of the formula used to calculate it.) 8. Enantiomers have almost all the same physical properties. One physical property that distinguishes two enantiomers is that they rotate PPL in equal but opposite directions. 9. What is the stereochemical relationship between (2R,3R,4R)-trichlorohexane and (2S,3S,4R)-trichlorohexane? They are diastereomers. 10. (True/False) None of the cis -dimethyl isomers of cyclohexane are chiral. True 11. Why does a catalyst speed up a chemical reaction? It lowers the energy of activation of the reaction. 12. Bond dissociation energies are the energies associated with the homolytic (homolytic or heterolytic) cleavage of a bond between two atoms. H 3 C CH 3 CH(CH 3 ) 2
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Cl H H 3 C CH 3 CH 3 C CH 3 H 3 C CH 3 CH 3 CH CH CH CH CH 2 H 2 C Cl CH CH 3 CH 3 CH 3 CH 3 CH 3 CHO H HO CH 2 OH CH 3 H 3 C HO Cl II. Write IUPAC Names For the Following Compounds. Use R and S When Necessary. (11 Points)
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This note was uploaded on 02/23/2010 for the course CHEM 201 taught by Professor Smith during the Spring '10 term at Duke.

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chm2210sex2ans - Organic Chemistry I CHM2210 Exam 2 Fall...

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