GATE CY exam:gate PYQs & Answers — Page 18

Questions 171–180 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 18 of 65

Fischer presentation of D-(-)-fructose is given below.

The correct structure of

-L-(+)-fructofuranose is

Your answerChoose one option.

Diagram for Chemistry question 41 (figure 2)

Diagram for Chemistry question 41 (figure 3)

Diagram for Chemistry question 41 (figure 4)

Diagram for Chemistry question 41 (figure 5)

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The major products X and Y in the following reaction sequence are

Your answerChoose one option.

Diagram for Chemistry question 42 (figure 2)

Diagram for Chemistry question 42 (figure 3)

Diagram for Chemistry question 42 (figure 4)

Diagram for Chemistry question 42 (figure 5)

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The major products E and F in the following reaction sequence are

Your answerChoose one option.

E and F as shown in figure

Diagram for Chemistry question 43 (figure 2)

E and F as shown in figure

Diagram for Chemistry question 43 (figure 3)

E and F as shown in figure

Diagram for Chemistry question 43 (figure 4)

E and F as shown in figure

Diagram for Chemistry question 43 (figure 5)

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, and

are four Hückel molecular orbitals of benzene with orbital energies

, and

, respectively.

The correct order of the orbital energies is

(The six carbon atoms of benzene are denoted by A to F and

is the

orbital of

carbon of benzene.)

Your answerChoose one option.

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Consider the following six vibrational modes:

symmetric stretching of CO₂, O-H symmetric stretching of H₂O, stretching of HCl, stretching of H₂, N-H symmetric stretching of NH₃, and bending of CO₂.

Among these modes, if k number of modes are IR active but Raman inactive, l number of modes are IR inactive but Raman active, and m number of modes are both IR and Raman active.

k, l, and m, respectively, are

Your answerChoose one option.

1, 3, and 2

3, 1, and 2

1, 2, and 3

2, 1, and 3

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The correct statement for a thermally initiated radical polymerization in a solution is:

(Assume: Steady-state and equal reactivity of the propagating radicals, termination reactions are only by combination, and no chain transfer reaction.

Given: Rp = rate of polymerization, DP = degree of polymerization, [I] = initiator concentration, and [M] = monomer concentration.)

Your answerChoose one option.

with increase in [I], both Rp and DP increase.

with increase in [M], both Rp and DP increase.

Rp decreases with increase in [I] but DP increases with increase in [M].

DP increases with increase in [I] and DP decreases with increase in [M].

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and

are the molecular and molar translational partition functions of X₂, respectively, then

(N is the Avogadro number)

Your answerChoose one option.

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Among the following, the NMR active nucleus(nuclei) is (are)

Your answerSelect all correct options. You can choose more than one.

¹²C

¹⁹F

²H

¹⁶O

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The complex(es) that exhibit(s) optical isomerism is (are)

Your answerSelect all correct options. You can choose more than one.

[Fe(acac)₃]

cis-[Co(en)₂Cl₂]⁺

trans-[Co(en)₂Cl₂]⁺

[Co(en)₃]³⁺

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In aqueous solution of K₄[Fe(CN)₆], the allowed transition(s) is (are)

Your answerSelect all correct options. You can choose more than one.

⁵T₂g to ³E_g

¹A₁g to ¹T₁g

¹A₁g to ¹T₂g

⁵T₂g to ⁵E_g

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GATE CY exam:gate PYQs

Question 41

Question 42

Question 43

Question 44

Question 45

Question 46

Question 47

Question 48

Question 49

Question 50