GATE CY topic:chemical-reactions PYQs & Answers — Page 43

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Questions 421–430 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 43 of 65

In an NMR spectrometer operating at a magnetic field strength of 16.45 T, the resonance frequency (in MHz, rounded off to one decimal place) of

F nucleus is ______

(Given: g factor of

F = 5.255;

= 5.05 × 10

J T

; h = 6.626 × 10

J s)

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When three moles of helium is mixed with one mole of neon at constant temperature and pressure (25 °C, 1 atm), the entropy of mixing (in J K

, rounded off to two decimal places) is ______

(Given: R = 8.314 J K

mol

)

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At 25 °C, the emf (in volts, rounded off to three decimal places) of the cell,

Ag | AgBr(s) | Br

(a = 0.20), Cu

(a = 0.48), Cu

(a = 0.24) | Pt

is ______

(Given: The standard emf of the cell is 0.082 V; R = 8.314 J K

mol

; F = 96500 C mol

)

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For an enzyme catalyzed reaction, the plot of inverse of initial rate against inverse of initial substrate concentration is linear with slope 0.16 s and intercept 2.12 mol

L s. The estimated value of Michaelis constant (in mol L

, rounded off to two decimal places) is ______

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Fluorescence quantum yield and fluorescence lifetime of a molecule are 0.4 and 5 × 10

s, respectively. If the fluorescence decay rate constant is Y × 10

, the value of Y (rounded off to nearest integer) is ______

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Major product formed in the following reaction sequence is:

Your answerChoose one option.

Diagram for Chemistry question 26 (figure 2)

Diagram for Chemistry question 26 (figure 3)

Diagram for Chemistry question 26 (figure 4)

Diagram for Chemistry question 26 (figure 5)

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Major products P and Q, in the given reaction sequence, are:

Your answerChoose one option.

Diagram for Chemistry question 27 (figure 2)

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Diagram for Chemistry question 27 (figure 4)

Diagram for Chemistry question 27 (figure 5)

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Major products P and Q formed in the reactions given below, are:

Your answerChoose one option.

Diagram for Chemistry question 28 (figure 2)

Diagram for Chemistry question 28 (figure 3)

Diagram for Chemistry question 28 (figure 4)

Diagram for Chemistry question 28 (figure 5)

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A compound with molecular formula C

showed a strong IR band at ~ 1720 cm

, a peak at m/z 122 in the mass spectrum and the following

H NMR signals: δ 8.1–8.0 (2H, m), 7.6–7.5 (1H, m), 7.5–7.3 (2H, m), 4.3 (2H, t), 1.8 (2H, sextet) and 1.0 (3H, t). The structure of the compound is:

Your answerChoose one option.

Diagram for Chemistry question 29 (figure 2)

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Diagram for Chemistry question 29 (figure 4)

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Major product formed in the following synthetic sequence is:

Your answerChoose one option.

Diagram for Chemistry question 30 (figure 2)

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Diagram for Chemistry question 30 (figure 4)

Diagram for Chemistry question 30 (figure 5)

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GATE CY topic:chemical-reactions PYQs

Question 21

Question 22

Question 23

Question 24

Question 25

Question 26

Question 27

Question 28

Question 29

Question 30