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Test: Stereochemistry Level - 3 - Chemistry MCQ


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30 Questions MCQ Test Organic Chemistry - Test: Stereochemistry Level - 3

Test: Stereochemistry Level - 3 for Chemistry 2024 is part of Organic Chemistry preparation. The Test: Stereochemistry Level - 3 questions and answers have been prepared according to the Chemistry exam syllabus.The Test: Stereochemistry Level - 3 MCQs are made for Chemistry 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Stereochemistry Level - 3 below.
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Test: Stereochemistry Level - 3 - Question 1

The number of structural isomers for C6H14 is:

Test: Stereochemistry Level - 3 - Question 2

Identify N and M:

Detailed Solution for Test: Stereochemistry Level - 3 - Question 2

The number of isomeric products N is 6 and the number of isomeric products M is 4.  They are as shown.
M d, l cannot be separated by fractional distillation.

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Test: Stereochemistry Level - 3 - Question 3

Among the following molecules, the one that is chiral is:

Detailed Solution for Test: Stereochemistry Level - 3 - Question 3

The molecules in options A, B and D contain plane of symmetry. Hence, these are achiral. The molecule in option C contains no plain of symmetry. It contains a carbon atom which is attached to four different atoms or groups. Hence, the molecule is chiral. 

Test: Stereochemistry Level - 3 - Question 4

The number of Diastereomers possible for the following compound is:

Detailed Solution for Test: Stereochemistry Level - 3 - Question 4

Correct Answer :- c

Explanation : The maximum number of diastereomers is 2n−2

n = 2

=> 2(2) - 2

= 4 - 2

= 2

Test: Stereochemistry Level - 3 - Question 5

The compounds having C3-axis of symmetry are:




Test: Stereochemistry Level - 3 - Question 6

Which one of the following conformations of cyclohexane is chiral:

Test: Stereochemistry Level - 3 - Question 7

Increasing order of stability among the three main conformations (i.e.. Eclipse, Ami, Gauche) of 2-fluoroethanol is  

Detailed Solution for Test: Stereochemistry Level - 3 - Question 7

Test: Stereochemistry Level - 3 - Question 8

The abso lute configuration of:

Test: Stereochemistry Level - 3 - Question 9

The tautomer of II is:

Detailed Solution for Test: Stereochemistry Level - 3 - Question 9

(a) 

Test: Stereochemistry Level - 3 - Question 10

After prolonged treatment of (A) by D2O/DO, the difference in molecule weights of compounds (A) and (B) is:

Detailed Solution for Test: Stereochemistry Level - 3 - Question 10



Here only the acidic hydrogen, the one attached to the double bond carbon atoms will be changed to D and the rest of the compound will remain the same.

Mass difference = 4 × 2 − 4 = 4

Test: Stereochemistry Level - 3 - Question 11

The most stable conformation for the following compound is:

Test: Stereochemistry Level - 3 - Question 12

The correct order of magnitude of ‘A value’ for the given subst ituents in cyclohexane derivatives is:

Test: Stereochemistry Level - 3 - Question 13

The most stable conformation of 2-fluoroethanol is:

Test: Stereochemistry Level - 3 - Question 14

The correct statements about conformations X and Y  of 2-butanone are:

(I) X is more stable than Y
(II) Y is more stable than X
(III) Methyl groups in X are anti
(IV) Methyl groups in Y are gauche

Test: Stereochemistry Level - 3 - Question 15

In the most stable conformation of neomenthol, stereochemical  orientation of the three substituents on the cyclohexane ring are:

Test: Stereochemistry Level - 3 - Question 16

The [α]D of a 90% optically pure 2-arylpropanoic acid solutions is +135°. On treatment with a base at RT for one hour, [α]D changed to +120°. The optical purity is reduced to 40% after 3 hours. If so, the optically purity of the solution after 1 hour, and its [α]D after 3 hours, respectively, would be:

Test: Stereochemistry Level - 3 - Question 17

An optically active compound enriched with R-enantiomer (60% ee) exhibited [α]D + 90°. If the, [α]D value of the sample is -135°, the ratio of R and S enantiomers would be:

Test: Stereochemistry Level - 3 - Question 18

Which of the following groups has the highest priority according to the Cahn-Ingold-Prelog sequence rules?

*Multiple options can be correct
Test: Stereochemistry Level - 3 - Question 19

The correct statement(s) concerning the structures E, F and G is (are)

 

*Multiple options can be correct
Test: Stereochemistry Level - 3 - Question 20

Which of the following cyclopentane derivative is/are optically active: 

*Multiple options can be correct
Test: Stereochemistry Level - 3 - Question 21

Which of the following molecules is (are) chiral: 

Test: Stereochemistry Level - 3 - Question 22

The binaphthol (Bnp) is:

Detailed Solution for Test: Stereochemistry Level - 3 - Question 22


Compound give Atropi isomerism and is optically active due to absence of plane and centre of symmetry.

*Multiple options can be correct
Test: Stereochemistry Level - 3 - Question 23

Identify which of the structures below are meso structures:

Test: Stereochemistry Level - 3 - Question 24

Among A-D, the compounds which can't exhibit optical activity are: 

Detailed Solution for Test: Stereochemistry Level - 3 - Question 24

From above options:

B) is meso compound, so, it won't show optical activity

A) N is sp3 hybridized to 4 different atoms connected, so, it will show optical activity

C) Sulfur is attached to 4 different atoms including lone pair and there is no chance of flipping due to large size to sulfur as compared to nitrogen, so, it will also show optical activity

 D) is asymmetric carbon with for different atoms and obviously, it will show optical activity.

Hence B is the answer.

*Multiple options can be correct
Test: Stereochemistry Level - 3 - Question 25

Consider the following statements:

*Multiple options can be correct
Test: Stereochemistry Level - 3 - Question 26

The molecule(s) that exist as meso structure(s) is/are:

Detailed Solution for Test: Stereochemistry Level - 3 - Question 26

Correct Answer :- a,b

Explanation : A meso compound is a molecule that has chiral centers but also has an internal plane of symmetry. This renders the molecule achiral: it does not have an enantiomer, and it does not rotate plane polarized light . Therefore option a amd b are correct.

*Multiple options can be correct
Test: Stereochemistry Level - 3 - Question 27

Amongst the following amino acids, the (S)–enantiomer is represented by:

Detailed Solution for Test: Stereochemistry Level - 3 - Question 27

When the highest priority substituent to the lowest priority substituent are arranged in a clockwise manner the then the stereocenter is labeled R ("Rectus"  Latin= "right"). In an amino acid the highest priority group is NH2​ then COOH and then CH3​. In option C the amino acid has right handed configuration of substituents and therefore is R− enantiomer. 


*Multiple options can be correct
Test: Stereochemistry Level - 3 - Question 28

Which of the following structure is meso–2, 3–butanediol:

Test: Stereochemistry Level - 3 - Question 29

Compounds which have different arrangements of atoms in space while having the same atoms bonded to each other are said to have

Detailed Solution for Test: Stereochemistry Level - 3 - Question 29

Ans: d

Explanation: Stereoisomer contrasts with structural isomers, which share the same molecular formula, but the bond connections or their order differs. By definition, molecules that are stereoisomers of each other represent the same structural isomer.

Test: Stereochemistry Level - 3 - Question 30

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

Detailed Solution for Test: Stereochemistry Level - 3 - Question 30

3-Methylhexane shows optical activity as shown below:
organic-chemistry-questions-answers-stereochemistry-q7

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