Stereochemistry Quiz Questions And Answers

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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. With her expertise, Dr. Waxali ensures the accuracy and relevance of our chemistry quizzes, contributing to a comprehensive understanding of chemical principles and advancements in the field.

, PhD, Chemistry

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Quizzes Created: 1 | Total Attempts: 26,864

Questions: 15 | Attempts: 26,915 | Updated: Feb 12, 2024

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Have you studied stereochemistry at your school? Take this stereochemistry quiz with informative questions and answers to find how well you remember the structure of molecules. To ace this quiz, all you need is complete knowledge about atoms and molecules. Further, you can share the quiz with your friends and compete by taking the quiz.

Questions and Answers

1.

How many asymmetric carbons are present in the compound below?
- A.
  
  1
- B.
  
  2
- C.
  
  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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6
0
2.

How many asymmetric carbons are present in the compound below?

Correct Answer
2

Explanation
The compound shown in the question contains two asymmetric carbons. Asymmetric carbons, also known as chiral carbons, are carbon atoms that are bonded to four different groups. In this compound, there are two carbon atoms, each bonded to four different groups, making them asymmetric or chiral. Therefore, the correct answer is 2.

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5
4 0
3.

How many asymmetric carbons are present in the compound below? -ethyl-2,2,4-trimethylpentane

Correct Answer
1

Explanation
The compound -ethyl-2,2,4-trimethylpentane has one asymmetric carbon. An asymmetric carbon is defined as a carbon atom that is bonded to four different groups. In this compound, there is only one carbon atom that meets this criteria, which is the carbon atom in the middle of the pentane chain. The other carbon atoms in the compound have either identical or repeated groups bonded to them, making them symmetric. Therefore, there is only one asymmetric carbon in the compound.

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9
4 3
4.

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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2
0
5.

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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32
2
6.

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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6
2
7.

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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9
2
8.

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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14
2
9.

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

Explanation
The given correct answer is "Same Compound." This means that the pair of compounds shown are identical and have the same chemical structure. The single bonds around the central carbon atom are rotatable; as such, these two images represent the same molecule.

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13
4
10.

Which of the following terms best describes the pair of compounds shown: enantiomers, diastereomers, or the same compound?
- A.
  
  Enantiomers
- B.
  
  Diastereomers
- C.
  
  Same Compound
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
11.

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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9
4 0
12.

Stereoisomers which are not mirror image isomers are __________.

Correct Answer
diastereomers, diastereoisomers

Explanation
Diastereomers or diastereoisomers are stereoisomers that are not mirror images of each other. They have different physical and chemical properties, and can have different configurations at one or more chiral centers. Unlike enantiomers, which are mirror images and have identical physical properties, diastereomers can have different melting points, boiling points, and solubilities. Therefore, diastereomers are the correct answer to the question as they fit the description of stereoisomers that are not mirror image isomers.

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0
4 2
13.

How many enantiomers are there of the molecule shown below?
- A.
  
  6
- B.
  
  2
- C.
  
  0
- D.
  
  1
- E.
  
  3
Correct Answer
C. 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
14.

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

Explanation
The given answer, "Same Compound," suggests that the pair of compounds shown are identical to each other. This means that they have the same molecular formula and connectivity of atoms. In other words, they are mirror images of each other and cannot be superimposed. This indicates that they are enantiomers, which are a type of stereoisomers. Enantiomers have the same physical and chemical properties, except for their interaction with plane-polarized light.

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2
0
15.

Which of the following terms best describes the pair of compounds shown: enantiomers, diastereomers, or the same compound?
- A.
  
  Enantiomers
- B.
  
  Diastereomers
- C.
  
  Same Compound
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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18
2

Zohra Sattar |PhD, Chemistry |

Chemistry Expert

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Current Version
Feb 12, 2024

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Expert Reviewed by
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Mar 20, 2011

Quiz Created by
Mdrickicki

Stereochemistry Quiz Questions And Answers

How many asymmetric carbons are present in the compound below?

How many asymmetric carbons are present in the compound below?

How many asymmetric carbons are present in the compound below? -ethyl-2,2,4-trimethylpentane

Is the molecule shown chiral or achiral?

Is the molecule shown chiral or achiral?

Is the molecule shown chiral or achiral?

Is the molecule shown chiral or achiral?

Is the molecule shown chiral or achiral?

Which of the following terms best describes the pair of compounds shown: enantiomers, diastereomers, or the same compound?

Which of the following terms best describes the pair of compounds shown: enantiomers, diastereomers, or the same compound?

How many asymmetric carbons are present in the compound below?

Stereoisomers which are not mirror image isomers are __________.

How many enantiomers are there of the molecule shown below?

Which of the following terms best describes the pair of compounds shown: enantiomers, diastereomers, or the same compound?

Which of the following terms best describes the pair of compounds shown: enantiomers, diastereomers, or the same compound?