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Stereochemistry - Chemistry MCQ


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20 Questions MCQ Test - Stereochemistry

Stereochemistry for Chemistry 2024 is part of Chemistry preparation. The Stereochemistry questions and answers have been prepared according to the Chemistry exam syllabus.The Stereochemistry MCQs are made for Chemistry 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Stereochemistry below.
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Stereochemistry - Question 1

Topological relation between Ha and Hb in given molecules respectively.

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Stereochemistry - Question 2

Correct configurations of stereo centres for the given molecules A and B respectively, will be.

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Stereochemistry - Question 3

The compounds given below are 

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Stereochemistry - Question 4

The more stable conformation of the following compound

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In the given compound, all substituent in cis position (above the plane). So, all group must be in up side.

Stereochemistry - Question 5

What will be the relation between two molecules given below

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Compound A/B are configuration enantiors. 

Stereochemistry - Question 6

Which of the following pairs of compound are enantiomers

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Stereochemistry - Question 7

Which of the following statements most accurately describes the stereochemistry between the various cyclohexanes?

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In the below given diagram of trans-1,3-dichlorohexane the chlorines cannot be positioned diaxial or diequatorial but can only be axial and equatorial or vice versa. Additionally, if they were diastereomers or structural isomers, then they could be separated by physical means.

Stereochemistry - Question 8

Among the following which compound is resolvable?

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Stereochemistry - Question 9

The total number of isomer possible for 1, 3-dimethylcyclohexane is/are_______


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Total number of isomer = 3

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Stereochemistry - Question 10

(+)-Mandelic acid has a specific rotation of +1600. The observed specific rotation of a mixture of 40%(-) mandelic acid and 60% (+)- mandelic acid is _______(answer should be an integer).


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Stereochemistry - Question 11






The correct option about above configurations is

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Stereochemistry - Question 12

Which of the following of molecule can Not give conformational isomers?

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Stereochemistry - Question 13

The configuration (R/S notation) at C-1 and C-6 of the compound below are 

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Stereochemistry - Question 14

Which of the following is E isomer?

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Stereochemistry - Question 15

From the below compounds I, II, III, and IV chiral compound is: 

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In A, C, and D, the plane of symmetry is there, so the only chiral molecule is option B.

Stereochemistry - Question 16

Which of the following statements can be deduced about the stereochemistry of this compound?

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In identifying stereogenic centers, any quaternary or tertiary carbons would be a good place to look. There are no quaternary carbons, and all the tertiary carbons are part of a benzene ring structure.

Stereochemistry - Question 17

Conformation of some compounds are given below:
Out of these structures, less prefered conformation is

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Stereochemistry - Question 18

Which of the following is an alkane which can exhibit optical activity?

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3-Methyl pentane shows optical activity as shown below:

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Stereochemistry - Question 19

How many comounds is/are optically active



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Stereochemistry - Question 20

What is the stereochemical relationship between the following two molecules?  

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The given compound, 1,2-dimethylcyclobutane has two chiral centers, and hence, has maximum of 22=4 stereoisomers. However, as shown in the scheme below, the cis-isomer has a plane of symmetry, and as a consequence, it is a meso-isomer:
 

However, trans-isomer can exists in two forms: (1R,2R)-1,2-dimethylcyclobutane and (1S,2S)-1,2-dimethylcyclobutane (see Scheme A).

The two isomers given in the question are both trans-isomers. Thus, they woul be either identical or enanthiomers as shown in the Scheme A (cannot be diastereomers). Although, the OP's visualization is correct and can use to identify simple molecule like this, it is hard to visualize if presented complex molecule. The best way to identify stereoisomers are assign their appropriate (R/S)-configurations as I have done for OP's structures (see Scheme B).

Accordingly, both structures are (1R,2R)-1,2-dimethylcyclobutane. Thus, the compounds are identical.

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