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A) All (+) enantiomers are levorotatory
B) All (-) enantiomers rotate plane polarized light in a counterclockwise direction
C) (+) and (-) enantiomers rotate plane polarized light in opposite directions
D) All R enantiomers are dextrorotatory
A) I, II and III
B) II, III and IV
C) II and III
D) I, III and IV
E) I, II, III and IV
A) cis 1, 4- dimethylcyclohexane
B) trans 1, 4- dimethylcyclohexane
C) cis 1,4- dimethylcycloheptane
D) trans 1, 4- dimethylcycloheptane
A) Enantiomers
B) Diastereomers
C) Identical
D) Constitutional isomers
A) Every achiral compound
B) A racemic mixture
C) A meso compound
D) A 50-50 mixture of R and S enantiomers
E) All the above
16. A mixture of equal amounts of two enantiomers __________.
A) Is called a racemic mixture
B) Is optically inactive
C) Implies that the enantiomers are meso forms
D) Both A and B
E) None of the above
17. Which of the following is chiral?
A) cis-1-bromo-3-chlorocyclobutane
B) cis-1, 4-dimethylcyclohexane
C) trans-1, 3-dimethylcyclohexane
D) trans-1-bromo-3-chlorocyclobutane
E) cis-1, 3-dimethylcyclohexane
20. Which of the statements below correctly describes an achiral molecule?
A) The molecule might be a meso form.
B) The molecule has a nonsuperimposable mirror image.
C) The molecule exhibits optical activity when it interacts with plane-polarized light.
D) The molecule has an enantiomer.
E) None of the above.
H-H-C=C-H-H + H2
a.Identify the mechanism of the reaction
b.Doubling the concentration of hydrogen has no effect on the reaction rate. Doubling the concentration of ethane also has no effect.
i.What is the reaction order of this reaction with respect to ethane? Hydrogen? What is the overall order?
ii.Write the rate equation for this reaction.
iii.Suggest what one might do to accelerate the reaction.
Why benzofuran is more stable than furan towards acid?
