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Test: Stereochemistry Level - 2


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30 Questions MCQ Test Organic Chemistry | Test: Stereochemistry Level - 2

Test: Stereochemistry Level - 2 for Chemistry 2023 is part of Organic Chemistry preparation. The Test: Stereochemistry Level - 2 questions and answers have been prepared according to the Chemistry exam syllabus.The Test: Stereochemistry Level - 2 MCQs are made for Chemistry 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Stereochemistry Level - 2 below.
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Test: Stereochemistry Level - 2 - Question 1

Ring flipping of the compound in the following conformation leads to:

Test: Stereochemistry Level - 2 - Question 2

The compound in ‘R’ configuration is:

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

In option B and C one of the terminal carbons has the same group, so it is neglected and in A H has least priority. Rotation gives S configuration and since it is at wedge position so we reverse it and S -> R we get the configuration to be R and hence A is correct.

Test: Stereochemistry Level - 2 - Question 3

Draw the structure of (2R, 3S) – 2, 3 – dichloropentane:

Test: Stereochemistry Level - 2 - Question 4

The most stable confirmation of following compound is:

Test: Stereochemistry Level - 2 - Question 5

Structure of 1, 2-dimethylcyclohexane is show below. Which of the following is an enantiomer to the given conformer:

Detailed Solution for Test: Stereochemistry Level - 2 - Question 5

Test: Stereochemistry Level - 2 - Question 6

Which is the most stable conformation of 1-chloro-4-methylcyclohexane:

Test: Stereochemistry Level - 2 - Question 7

Which of the following is a structure representation is R-Lactic acid:



Detailed Solution for Test: Stereochemistry Level - 2 - Question 7

(R)-lactic acid is an optically active form of lactic acid having (R)-configuration. It has a role as an Escherichia coli metabolite and a human metabolite. It is a conjugate acid of a (R)-lactate. It is an enantiomer of a (S)-lactic acid.

The chiral carbon atom has all four different group attached to it.

∴ It has one asymmetric or chiral carbon atom.

There option b) is correct.

Test: Stereochemistry Level - 2 - Question 8

The favored conformation (gauche, anti) for the molecule 1, 2-dichloro ethane; and 1,2-ethanediol will be respectively:

Test: Stereochemistry Level - 2 - Question 9

Which of the following term best describes the pair of compound shown below:

Test: Stereochemistry Level - 2 - Question 10

The major product is formed in the following reaction is:

Test: Stereochemistry Level - 2 - Question 11

The configurations at the three chiral centres in the bicyclodecano l given below, are:

Test: Stereochemistry Level - 2 - Question 12

The S enantiomer of ibuprofen is responsible for its pain – relieving properties. Which one of the following structures shown in (S) – ibuprofen:

Detailed Solution for Test: Stereochemistry Level - 2 - Question 12

Giving the numbers according to their priority we get:

 

Since 1 -> 2 -> 3 -> 4 is in the anti clockwise direction, It has S configuration.

Hence D is correct.

Test: Stereochemistry Level - 2 - Question 13

The major product formed in the following reaction is:

Detailed Solution for Test: Stereochemistry Level - 2 - Question 13

Here, basic conditions are given so

  1. Most acidic H+ ion is removed which is attached to the carbon atom at benzylic position.

  2. Then to stabilize the carbanion, elimination reaction mechanism takes place.

  3. Leading to the removal of leaving group -OTs, forming a double bond between the two carbon atoms.

Hence D is correct.

Test: Stereochemistry Level - 2 - Question 14

Draw the structure of (1 R, 2 S, 3 S)-1, 2-dibromo-3-ethyl cyclo hexane:

Test: Stereochemistry Level - 2 - Question 15

The absolute configurations of the chiral centers in X and Y are:

Detailed Solution for Test: Stereochemistry Level - 2 - Question 15

Test: Stereochemistry Level - 2 - Question 16

Stereoisomers which are not mirror image isomers are:

Test: Stereochemistry Level - 2 - Question 17

Racemisat ion process is:

Test: Stereochemistry Level - 2 - Question 18

The configuration of the following position of (I) and (II) is:

Test: Stereochemistry Level - 2 - Question 19

Resolution is called as:

Test: Stereochemistry Level - 2 - Question 20

Which is the correct structure of D-Glyceraldehyde:

Detailed Solution for Test: Stereochemistry Level - 2 - Question 20

All the options A, B and C are same

  1. When A is rotated by 90 degrees two times i.e. 180 degrees in plane of your screen then compound C will be obtained

  2. Now by switching A two times or ‘even’ switch compound B will be obtained and configuration remained same as the switch was even

Hence all are the same, so, D is correct.

Test: Stereochemistry Level - 2 - Question 21

Which of the following structure represents meso compounds:

Test: Stereochemistry Level - 2 - Question 22

The two compounds shown below are:

Test: Stereochemistry Level - 2 - Question 23

Which of the following statements is true for the compound (R)-2-butanol:

Test: Stereochemistry Level - 2 - Question 24

What kind of isomers are the two compound below:

Test: Stereochemistry Level - 2 - Question 25

Among the structures given below, the most stable conformation for the following compound is:

Detailed Solution for Test: Stereochemistry Level - 2 - Question 25

Correct Answer :- c

Explanation :

Test: Stereochemistry Level - 2 - Question 26

Which of the following term correctly describes the structural relationship between cis-1,3 dimethyl cyclopentane and trans-1,3-dimethyl cyclopentane:

Test: Stereochemistry Level - 2 - Question 27

The gauche conformation (θ = 60o) of n-butane possess:

Test: Stereochemistry Level - 2 - Question 28

The absolute configuration of the two stereogenic (Chiral) centers in the following molecule is:

Detailed Solution for Test: Stereochemistry Level - 2 - Question 28

If minimum priority group on horizontal line is

Clockwise direction ⇒S

Anticlockwise rotation ⇒R

5S, 6R

Test: Stereochemistry Level - 2 - Question 29

The gauche interaction values for Me/Me, Me/Br and Br/Br are 3.3, 0.8 and 3.0 kJ/mol, respectively. Among the following, the most stable conformation of 2,3-dibromobutane is:

Test: Stereochemistry Level - 2 - Question 30

The most stable conformations of 1,2-difluoroethane and dl-2, 3-butanediol are:

Detailed Solution for Test: Stereochemistry Level - 2 - Question 30

The -F and -OH groups in gauche positions to each other help them get involved in dipole-dipole interactions and h-bond interactions respectively. Gauche position is optimum so as to provide proximity for the stabilising interaction but not too close as in eclipsed positions to give rise to steric strains.

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