Optical isomerism

Last updated: 15/02/2020

WJEC A-Level Chemistry Unit 4.1 – Stereoisomerism Optical isomerism

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Question 1 of 20

1. Question
What is the definition of optical isomerism?
- Pairs of molecules that are non-superimposable mirror images
- Molecules with the same structural formula but different molecular formula
- Molecules with the same molecular formula but different structural formula
- Pairs of molecules that are superimposable mirror images
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Question 2 of 20

2. Question
What is another name for an optical isomer?
- Chiral
- Imposable
- Rotational
- Isomer
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Question 3 of 20

3. Question
What is the definition of a chiral carbon?
- A carbon atom with four different groups attached
- A carbon with halogen atoms attached
- A carbon atom with the same groups attached
- A carbon with four hydrogen atoms attached
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Question 4 of 20

4. Question
What is another name for a chiral carbon?
- Chiral centre
- Impossible carbon
- Rotational carbon
- Central carbon
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Question 5 of 20

5. Question
What sign is usually used to indicate a chiral carbon?
- *
- x
- ^
- ~
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Question 6 of 20

6. Question
What is the definition of a racemic mixture?
- A 50:50 mixture of a pair of optical isomers
- A mixture of E/Z isomers
- A mixture of different optical isomers
- A mixture of structural isomers
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Question 7 of 20

7. Question
What is the definition of a racemate?
- A 50:50 mixture of a pair of optical isomers
- A sample of – isomers
- A sample of + isomers
- A mixture of stereoisomers
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Question 8 of 20

8. Question
What is another name for a racemate?
- Racemic mixture
- Racemate mixture
- Chiral carbon
- Optical isomer
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Question 9 of 20

9. Question
What is optical isomerism a form of?
- Stereoisomerism
- Structural isomerism
- Intermolecular forces
- Amphoeteric substances
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Question 10 of 20

10. Question
Which of the following types of carbon do optical isomers contain?
- Chiral carbon
- Central carbon
- Carbocation
- Chlorocarbon
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Question 11 of 20

11. Question
Which of the following is a feature of a pair of compounds with optical isomerism?
- Same structural formula
- Different structural formula
- Different molecule formula
- Superimposable mirror images
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Question 12 of 20

12. Question
Describe the rotation of the plane of polarisation for an + isomer.
- Clockwise
- No rotation
- Depends on the number of chiral carbons
- Anticlockwise
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Question 13 of 20

13. Question
Describe the rotation of the plane of polarisation for an – isomer.
- Anticlockwise
- No rotation
- Depends on the number of chiral carbons
- Clockwise
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Question 14 of 20

14. Question
Describe the effect of optical isomers on the plane of polarisation of polarised light.
- Polarises light in the opposite directions
- Polarises light, but only during daylight
- Polarises UV light
- Does not polarise light
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Question 15 of 20

15. Question
Why is a racemic mixture not optically active?
- The optical rotation of the two isomers in opposite directions cancel each other out
- There is no optical isomerism within the mixture of two stereoisomers
- Both chiral carbons within the optical isomers cancel each other out
- Both chiral carbons within the optical isomers react together
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Question 16 of 20

16. Question
Which of the following compounds show optical isomerism?
- Butan-2-ol
- Ethane
- Methanol
- 1,5-dichloropentan-3-one
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Question 17 of 20

17. Question
Which of the following compounds show optical isomerism?
- 2-hydroxypropanoic acid
- 1,3-dichlorobenzene
- Pentan-3-ol
- Phenol
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Question 18 of 20

18. Question
Which of the following compounds show optical isomerism?
- 2,3-dimethylpentane
- 1,3-dimethylpropane
- 3-bromopentane
- Benzene
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Question 19 of 20

19. Question
Which of the following compounds show optical isomerism?
- Pentan-2-ol
- Iodine
- Chlorofluorocarbon
- 2,3,6-trichlorobenzene
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Question 20 of 20

20. Question
Which of the following compounds show optical isomerism?
- Butan-2-ol
- Phenol
- Methanol
- Heptanol
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