Stereochemistry Quiz: Test Your Knowledge

Reviewed by Zohra Sattar Waxali

Zohra Sattar Waxali, PhD (Chemistry) |

Chemistry

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Dr. Zohra Sattar Waxali earned her doctorate in chemistry and biochemistry from Northwestern University, specializing in the metallomes of cardiac cells and stem cells, and their impact on biological function. Her research encompasses the development of arsenoplatin chemotherapeutics, stapled peptide estrogen receptor inhibitors, and antimicrobial natural products.

, PhD (Chemistry)

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Questions: 10 | Attempts: 27,503 | Updated: Sep 27, 2024

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Stereochemistry Quiz: Test Your Knowledge - Quiz

Stereochemistry, a cornerstone of organic chemistry, explores the intricate spatial arrangements of atoms within molecules and the profound impact these arrangements have on molecular properties and interactions. This Stereochemistry Quiz delves into the fascinating world of three-dimensional molecular structures, challenging your understanding of fundamental stereochemical concepts.

We will learn about the concept of chirality, where molecules exist as non-superimposable mirror images, and delve into the various types of isomers, including enantiomers and diastereomers, which possess unique configurations and exhibit distinct properties. Furthermore, we will examine different methods of visualizing and representing these molecules, such as Fischer projections Read moreand Newman projections, to enhance your understanding of their spatial relationships.

Stereochemistry Questions and Answers

1.

Is the molecule shown chiral or achiral?
- A.
  
  Chiral
- B.
  
  Achiral
Correct Answer
B. Achiral

Explanation
The term "chiral" refers to a molecule that is not superimposable in its mirror image, while "achiral" refers to a molecule that is superimposable in its mirror image. A symmetric line can be drawn in this molecule, making it achiral.

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4
0
2.

Is the molecule shown chiral or achiral?
- A.
  
  Chiral
- B.
  
  Achiral
Correct Answer
B. Achiral

Explanation
A molecule is considered chiral if it is not superimposable on its mirror image. In other words, a chiral molecule has a non-superimposable mirror image. On the other hand, an achiral molecule is one that is superimposable in its mirror image. A symmetric line can be drawn in this molecule, making it achiral.

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33
2
3.

Is the molecule shown chiral or achiral?
- A.
  
  Chiral
- B.
  
  Achiral
Correct Answer
B. Achiral

Explanation
A molecule is considered chiral if it lacks a plane of symmetry and has a non-superimposable mirror image. Conversely, a molecule is achiral if it possesses a plane of symmetry and its mirror image can be superimposed onto itself. A symmetric line can be drawn in this molecule, making it achiral. Additionally, the molecule shown is achiral because its mirror image will be the same as this image.

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7
2
4.

Is the molecule shown chiral or achiral?
- A.
  
  Chiral
- B.
  
  Achiral
Correct Answer
B. Achiral

Explanation
A molecule is considered chiral if it cannot be superimposed on its mirror image. On the other hand, a molecule is considered achiral if it can be superimposed on its mirror image. A symmetry line can be drawn in this molecule, making it achiral.

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10
2
5.

Is the molecule shown chiral or achiral?
- A.
  
  Chiral
- B.
  
  Achiral
Correct Answer
A. Chiral

Explanation
The term "chiral" refers to a molecule that cannot be superimposed on its mirror image. In other words, a chiral molecule has a non-superimposable mirror image. On the other hand, an "achiral" molecule can be superimposed on its mirror image. A line of symmetry cannot be drawn through this molecule, so it is chiral.

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16
2
6.

Which of the following terms best describes the pair of compounds shown: enantiomers, diastereomers, or the same compound?
- A.
  
  Enantiomers
- B.
  
  Diastereomers
Correct Answer
A. Enantiomers

Explanation
Enantiomers are a pair of molecules that are mirror images of each other and cannot be superimposed. They have the same connectivity but differ in their spatial arrangement. In this case, the pair of compounds shown are mirror images of each other (try rotating the second molecule), making them enantiomers.

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9
9
7.

How many asymmetric carbons are present in the compound below?
- A.
  
  1
- B.
  
  3
Correct Answer
A. 1

Explanation
There is only one asymmetric carbon present in the compound. An asymmetric carbon, also known as a chiral carbon, is a carbon atom that is bonded to four different groups. In the given compound, there is only one carbon atom that meets this criteria, making it the only asymmetric carbon.

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8
0
8.

How many asymmetric carbons are present in the compound below?

Correct Answer
5

Explanation
The compound shown in the question contains 5 asymmetric carbons. An asymmetric carbon is a carbon atom that is bonded to four different groups. In the given compound, there are five carbon atoms that meet this criteria, meaning all carbons on the main chain are all asymmetric carbons. Therefore, the correct answer is 5.

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10
4 0
9.

How many enantiomers are there of the molecule shown below?
- A.
  
  6
- B.
  
  0
Correct Answer
B. 0

Explanation
Enantiomers are mirror images of each other and have the same molecular formula but differ in their spatial arrangement. The molecule shown in the question does not have any chiral centers or asymmetric carbons, which are necessary for the existence of enantiomers. This molecule is achiral and has a symmetry plane. Hence, there are no enantiomers of this molecule.

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5
0
10.

Which of the following terms best describes the pair of compounds shown: enantiomers, diastereomers, or the same compound?
- A.
  
  Enantiomers
- B.
  
  Diastereomers
Correct Answer
A. Enantiomers

Explanation
The pair of compounds shown are enantiomers. Enantiomers are a type of stereoisomer that are mirror images of each other and cannot be superimposed on one another. They have the same connectivity of atoms but differ in their spatial arrangement. In this case, the compounds shown have the same molecular formula but are non-superimposable mirror images of each other, making them enantiomers.

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19
2