GATE CY year:2021 PYQs & Answers — Page 5

Questions 41–50 of 65. Imported answers require independent review unless marked reviewed.

Topic practice 65 questionsPage 5 of 7

The major product formed in the following reaction

is:

Your answerChoose one option.

Diagram for Chemistry question 31 (figure 2)

Diagram for Chemistry question 31 (figure 3)

Diagram for Chemistry question 31 (figure 4)

Diagram for Chemistry question 31 (figure 5)

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The major product formed in the following reaction [starting material: 1,2-diphenylbenzocyclobutene; methyl acrylate, CO₂Me, heat] is:

Your answerChoose one option.

Diagram for Chemistry question 32 (figure 2)

Diagram for Chemistry question 32 (figure 3)

Diagram for Chemistry question 32 (figure 4)

Diagram for Chemistry question 32 (figure 5)

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In the following reaction sequence [indanyl methyl ether treated with (i) sec-BuLi, THF; (ii) ZnCl₂ to give P; then 2-bromopyridine, Pd(PPh₃)₄, THF to give Q], the major products P and Q, respectively, are:

Your answerChoose one option.

Diagram for Chemistry question 33 (figure 2)

Diagram for Chemistry question 33 (figure 3)

Diagram for Chemistry question 33 (figure 4)

Diagram for Chemistry question 33 (figure 5)

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In an electrochemical cell, Ag⁺ ions in AgNO₃ are reduced to Ag metal at the cathode and Cu is oxidized to Cu²⁺ at the anode. A current of 0.7 A is passed through the cell for 10 min. The mass (in grams) of silver deposited and copper dissolved, respectively, are: [Faraday Constant = 96,485 C mol⁻¹, Atomic Weight of Ag = 107.9, Atomic Weight of Cu = 63.55]

Your answerChoose one option.

0.469 and 0.138

0.235 and 0.138

0.469 and 0.069

0.235 and 0.069

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Among the following

the compounds which can be prepared by nucleophilic substitution reaction are:

Your answerChoose one option.

III, IV, and V

I, II, and VI

II, IV, and VI

I, III, and V

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In the following reaction

the major products X and Y, respectively, are:

Your answerChoose one option.

Diagram for Chemistry question 36 (figure 2)

Diagram for Chemistry question 36 (figure 3)

Diagram for Chemistry question 36 (figure 4)

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The major products P and Q formed in the following reactions [two reaction schemes shown], respectively, are:

Your answerChoose one option.

Diagram for Chemistry question 37 (figure 2)

Diagram for Chemistry question 37 (figure 3)

Diagram for Chemistry question 37 (figure 4)

Diagram for Chemistry question 37 (figure 5)

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The major product formed in the reaction of (2R,3R)-2-bromo-3-methylpentane with NaOMe is:

Your answerChoose one option.

(Z)-3-methylpent-2-ene

(E)-3-methylpent-2-ene

(2R,3R)-2-methoxy-3-methylpentane

(2S,3R)-2-methoxy-3-methylpentane

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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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Hexane and heptane are completely miscible. At 25 °C, the vapor pressures of hexane and heptane are 0.198 atm and 0.06 atm, respectively. The mole fractions of hexane and heptane in the vapor phase for a solution containing 4 M hexane and 6 M heptane, respectively, are:

Your answerChoose one option.

0.688 and 0.312

0.400 and 0.600

0.312 and 0.688

0.600 and 0.400

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GATE CY year:2021 PYQs

Question 31

Question 32

Question 33

Question 34

Question 35

Question 36

Question 37

Question 38

Question 39

Question 40