GATE CY year:2017 PYQs & Answers — Page 5

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

Topic practice 65 questionsPage 5 of 7

For the following three alkenes, 1, 2 and 3, the rates of hydrogenation using Wilkinson’s catalyst at 25 °C vary in the order

1: cyclohexene; 2: alkene with CH₃ and C₂H₅ substituents on one alkene carbon and H on the other; 3: methyl-substituted cyclohexene

Your answerChoose one option.

1 > 3 > 2

1 > 2 > 3

2 > 1 > 3

2 > 3 > 1

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undergoes

decay to

of its initial amount in 15 days. The time required for its decay to

of its initial amount is ______ days (up to two decimal places).

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The metal ion and the macrocyclic skeleton present in the green pigment of plants, respectively, are

Your answerChoose one option.

Mg(II) and chlorin

Mg(II) and corin

Mn(II) and chlorin

Mg(II) and porphine

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The spinel structure of

has cubic close packed arrangement of oxide ions. The fractions of the octahedral and tetrahedral sites occupied by cations, respectively, are

Your answerChoose one option.

and

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The diffusion limiting current (

) at a dropping mercury electrode for an aqueous Mg(II) solution of concentration ‘c’ (mol L

) is 300 μA. If ‘c’ is increased by 0.1 mol L

increases to 900 μA. The value of ‘c’ (in mol L

) is ______ (up to two decimal places).

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The major product formed in the following reaction is

Your answerChoose one option.

Diagram for Chemistry question 46 (figure 2)

Diagram for Chemistry question 46 (figure 3)

Diagram for Chemistry question 46 (figure 4)

Diagram for Chemistry question 46 (figure 5)

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The product formed in the following photochemical reaction is

Your answerChoose one option.

Diagram for Chemistry question 47 (figure 2)

Diagram for Chemistry question 47 (figure 3)

Diagram for Chemistry question 47 (figure 4)

Diagram for Chemistry question 47 (figure 5)

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Among the following decahydroquinoline toluenesulfonates (Ts), the one that yields 9-methylamino-E-non-5-enal as a major product upon aqueous solvolysis is

Your answerChoose one option.

Diagram for Chemistry question 48 (figure 2)

Diagram for Chemistry question 48 (figure 3)

Diagram for Chemistry question 48 (figure 4)

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The product obtained in the following solvolysis reaction is

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a racemic mixture of trans 1,2-diacetoxycyclohexane

enantiomerically pure trans 1,2-diacetoxycyclohexane

racemic cis 1,2-diacetoxycyclohexane

a mixture of cis and trans 1,2-diacetoxycyclohexane

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The spectroscopic data for an organic compound with molecular formula C₁₀H₁₂O₂ are given below. IR band around 1750 cm⁻¹, ¹H NMR δ 7.3 (m, 5H), 5.85 (q, 1H, J = 7.2 Hz), 2.05 (s, 3H), 1.5 (d, 3H, J = 7.2 Hz) ppm. The compound is

Your answerChoose one option.

methyl 2-phenylpropionate

1-(phenylethyl) acetate

2-(phenylethyl) acetate

methyl 3-phenylpropionate

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GATE CY year:2017 PYQs

Question 41

Question 42

Question 43

Question 44

Question 45

Question 46

Question 47

Question 48

Question 49

Question 50