GATE CY Stereochemistry PYQs & Answers — Page 3

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Questions 21–30 of 33. Imported answers require independent review unless marked reviewed.

Topic practice 33 questionsPage 3 of 4

The major product formed in the following reaction [substrate shown; (i) LDA (1.1 equiv), (ii) PhCH₂Br (1.1 equiv), (iii) LiAlH₄ (3 equiv)] is:

Your answerChoose one option.

Diagram for Chemistry question 39 (figure 2)

Diagram for Chemistry question 39 (figure 3)

Diagram for Chemistry question 39 (figure 4)

Diagram for Chemistry question 39 (figure 5)

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Absolute stereochemistry of the given compound is:

Your answerChoose one option.

4aR, 8aS

4aR, 8aR

4aS, 8aS

4aS, 8aR

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The CORRECT statement with respect to the stereochemistry of α-hydroxy acids P and Q formed in the following reactions is:

Your answerChoose one option.

Both P and Q are formed with retention of configuration.

Both P and Q are formed with inversion of configuration.

P is formed with retention of configuration and Q with inversion of configuration.

P is formed with inversion of configuration and Q with retention of configuration.

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Among the following sets,

the total number of set(s) of diastereomeric pair(s) is ______

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Among the following compounds, the number of compounds that DO NOT exhibit optical activity at room temperature is ________.

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The major product formed in the following reaction is

(Reagents: 1. B₂H₆; 2. H⁺)

Your answerChoose one option.

Diagram for Chemistry question 35 (figure 2)

Diagram for Chemistry question 35 (figure 3)

Diagram for Chemistry question 35 (figure 4)

Diagram for Chemistry question 35 (figure 5)

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The specific rotation of optically pure (R)-2-bromobutane is −112.00. A given sample of 2-bromobutane exhibited a specific rotation of −82.88. The percentage of (S)-(+)-enantiomer present in this sample is ________.

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In the following reaction,

Your answerChoose one option.

X is the major product and Y is the minor product

X is the only product

Y is the only product

X is the minor product and Y is the major product

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The enantiomeric pair, among the following, is

Your answerChoose one option.

Diagram for Chemistry question 27 (figure 2)

Diagram for Chemistry question 27 (figure 3)

Diagram for Chemistry question 27 (figure 4)

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The product formed in the following reaction is

Your answerChoose one option.

a 1:1 mixture of

Diagram for Chemistry question 24 (figure 2)

and

Diagram for Chemistry question 24 (figure 3)

Diagram for Chemistry question 24 (figure 4)

Diagram for Chemistry question 24 (figure 5)

Diagram for Chemistry question 24 (figure 6)

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GATE CY Stereochemistry PYQs

Question 39

Question 5

Question 31

Question 44

Question 14

Question 35

Question 46

Question 26

Question 27

Question 24