GATE CY year:2025 PYQs & Answers — Page 5

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

The major products X and Y formed in the following reaction sequences are

Your answerChoose one option.

X and Y structures shown in figure

Diagram for Chemistry question 41 (figure 2)

X and Y structures shown in figure

Diagram for Chemistry question 41 (figure 3)

X and Y structures shown in figure

Diagram for Chemistry question 41 (figure 4)

X and Y structures shown in figure

Diagram for Chemistry question 41 (figure 5)

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Compound K displayed a strong band at 1680 cm

in its IR spectrum. Its

H-NMR spectral data are as follows:

(ppm) 7.30 (d, J = 7.2 Hz, 2H), 6.8 (d, J = 7.2 Hz, 2H), 3.8 (septet, J = 7.0 Hz, 1H), 2.2 (s, 3H), 1.9 (d, J = 7.0 Hz, 6H). The correct structure of compound K is

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Structure shown in figure

Structure shown in figure

Diagram for Chemistry question 42 (figure 2)

Structure shown in figure

Diagram for Chemistry question 42 (figure 3)

Structure shown in figure

Diagram for Chemistry question 42 (figure 4)

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The major product formed in the following reaction sequences is

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Diagram for Chemistry question 43 (figure 2)

Diagram for Chemistry question 43 (figure 3)

Diagram for Chemistry question 43 (figure 4)

Diagram for Chemistry question 43 (figure 5)

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In the following asymmetric transformation, the key aldol reaction involves the attack of

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Si face of enolate on to the Re face of aldehyde

Si face of enolate on to the Si face of aldehyde

Re face of enolate on to the Re face of aldehyde

Re face of enolate on to the Si face of aldehyde

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The correct option with regard to the following statements is

(a) Time-independent Schrödinger equation can be exactly solved for Be

(b) For a particle confined in a one-dimensional box of length

with infinite potential barriers, the trial variation function

is not an acceptable trial wavefunction for

(c) Wavefunctions for system of Fermions must be anti-symmetric with respect to exchange of any two Fermions in the system.

(d) Born-Oppenheimer approximation can be used to separate the vibrational and rotational motion of a molecule.

Your answerChoose one option.

(a) True (b) False (c) False (d) True

(a) True (b) True (c) False (d) False

(a) False (b) True (c) True (d) False

(a) False (b) True (c) True (d) True

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The phase diagram of a single component system is given below.

The option with the correct number of degrees of freedom corresponding to the labelled points i, j, and k, respectively, is

Your answerChoose one option.

0, 1, 2

3, 2, 1

2, 0, 1

0, 2, 1

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An approximate partition function

of a gas is given below.

The equation of state(s) for this gas is/are

[Note:

is a parameter independent of volume.]

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The compound(s) having structure similar to that of B₂H₆ is/are

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I₂Cl₆

Si₂Cl₆

Al₂Cl₆

Cl₂O₆

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The UV-visible spectrum of [Ni(en)₃]²⁺ (en = ethylenediamine) shows absorbance maxima at 1120 cm⁻¹, 1830 cm⁻¹, and 2900 cm⁻¹.

Absorbance maximum	Electronic transition
(a) 1120 cm⁻¹	(i) ³A₂g → ³T₁g (F)
(b) 1830 cm⁻¹	(ii) ³A₂g → ³T₂g
(c) 2900 cm⁻¹	(iii) ³A₂g → ³T₁g (P)

[Given: Atomic number of Ni = 28]

The correct match(es) between absorbance maximum and electronic transition is/are

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(a) → (ii)

(b) → (i)

(a) → (iii)

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Cytochrome P450 (CYP) enzymes catalyze stereoselective C–H hydroxylation of hydrocarbons in the presence of O₂. The correct statement(s) about the structure and activity of CYP is/are

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A thiolate group is coordinated to the Fe center at one of the axial positions around Fe.

While one of the oxygen atoms of O₂ is inserted into a C–H bond of a hydrocarbon, the other oxygen atom gets reduced to water.

An imidazole group is coordinated to the Fe center at one of the axial positions around Fe.

An iron-oxo species acts as a key oxidant in the catalytic cycle of CYP.

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GATE CY year:2025 PYQs

Question 41

Question 42

Question 43

Question 44

Question 45

Question 46

Question 47

Question 48

Question 49

Question 50