Order Exhibiting Cis-trans Isomerism

Order Exhibiting Cis-trans Isomerism
Order Exhibiting Cis-trans Isomerism
1. Lactic acid, , is a molecule that shows
(a) Geometrical isomerism
(b) Tautomerism
(c) Optical isomerism
(d) Metamerism
2. How many optical isomers are possible for lactic acid?
(a) 2
(b) 4
(c) 6
(d) 8
3. Which of the following represents a racemic mixture?
(a) 75% (R)-2-butanol, 25% (S)-2-butanol
(b) 25% (R)-2-butanol, 75% (S)-2-butanol
(c) 50% (R)-2-butanol, 50% (S)-2-butanol
(d) none of the above
4. Consider (R)- and (S)-2-butanol. Which physical
property distinguishes the two compounds?
(a) melting point
(b) solubility in common solvents
(c) Rotation of plane-polarized light
(d) Infrared spectrum
5. Which of the following is capable of exhibiting cis-trans
isomerism?
(a) 1-butene
(b) 1-pentene
(c) ethene
(d) 2-butene
6. Which of the following is a true statement?
(a) All chiral molecules possess a plane of symmetry.
(b) All achiral molecules are meso.
(c) All molecules which possess a single asymmetric center
of the S configuration are levorotatory.
(d) A mixture of achiral compounds will be optically inactive.
7. Which of the statements below correctly describes an
achiral molecule?
(a) The molecule has a nonsuperimposable mirror image.
(b) The molecule exhibits optical activity when it interacts
with plane-polarized light.
(c) The molecule has an enantiomer.
(d) The molecule might be a meso form.
8. How many asymmetric centers are present in a
molecule of 2,4,6-trimethylheptane?
(a) 0
(b) 1
(c) 2
(d) 3
9. Which of the following compounds is never chiral?
(a) 2,3-dibromobutane
(b) 1,3-dibromobutane
(c) 1,2-dichlorobutane
(d) 1,4-dibromobutane
20. Which of the following statements is correct
concerning a pair of enantiomers?
(a) They rotate the plane of polarized light by exactly the
same amount and in opposite directions.
(b) They rotate the plane of polarized light by
differing amounts and in opposite directions.
(c) They rotate the plane of polarized light by differing
amounts and in the same direction.
(d) They have different melting points.
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