OCHEM Exam 3

which of the following does not apply to the compound shown above?

• it has (R) configuration

• it could either be dextrorotatory or levorotatory

• it is a chiral compound

• it has an enantiomer

• it is optically active

predict the specific rotation of cis-1,4-dimethylcyclohexane

• because this compound represents a racemic mixture, the compound is dextrorotatory

• zero; the compound is achiral

• because both asymmetric centers are R, the compound is dextrorotatory

• because both asymmetric centers are S, the compound is levorotatory

• it is impossible to predict; it must be determined experimentally.

• the specific ration of (S)-2-iodoobutane is +15.90. what is the % composition of a mixture of (R) and (S)-2-idodobutane with a specific ration of -7.95?

• A. 48% (R) and 25% (S)

• B. 75% (R) and 25% (S)

• C. 76% (R) and 24% (S)

• D. 25% (R) and 75% (S)

• E. 24% (R) and 76% (S)

how many stereoisomers are possible for the molecule shown below?

• 194

• 128

• 132

• 228

• 256

Sn2 Reactions usually proceed with ____.

• slightly more inversion that retention at the center undergoing substitution

• complete inversion at the center undergoing substitution

• slightly more retention than inversion at the center undergoing substitution

• equal amounts of inversion and retention at the center undergoing substitution

• complete retention at the center undergoing substitution

what is the correct name of the following structure?

• A. (2R, 3R)-2-bromo-3-chlorobutane

• B. (2S, 3S)-2-bromo-3-chlorobutane

• C. (2R, 3S)-2-bromo-3-chlorobutane

• D.(2S, 3R)-2-bromo-3-chlorobutane

• none of the above

which of the following statements correctly describes E1 reactions of alkyl halides (RX)?

• Both II and IV

• III, IV, and V

• III only

• I, IV, and V

• I, III, V

which of the following will give me a meso compound in the Sn2 reaction below?

• Both II and III

• Both I and III

• Both I and II

• Both II and IV

• Both III and IV

what is the major product of the following reaction?

• A

• B

• C

• D

• E

which of the following is classified das a vinyl halide?

• A

• B

• C

• D

• E