GATE CY year:2020 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 CORRECT statement with respect to the stereochemistry of α-hydroxy acids P and Q formed in the following reactions is:

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Both P and Q are formed with retention of configuration.

Both P and Q are formed with inversion of configuration.

P is formed with retention of configuration and Q with inversion of configuration.

P is formed with inversion of configuration and Q with retention of configuration.

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The rate of solvolysis of the given compounds is in the order:

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T > R > Q > S > P

Q > T > R > P > S

R > T > Q > S > P

T > Q > R > P > S

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In the following reaction sequence, the major products Q and R are:

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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 the electronic absorption spectrum of an aqueous solution of [Ni(NH₃)₆]²⁺, a very weak band is observed between the bands due to the transitions ³A₂g → ³T₂g and ³A₂g → ³T₁g(F). The transition responsible for the very weak band is (Given: atomic number of Ni is 28)

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³A₂g → ¹T₁g

³A₂g → ¹T₂g

³A₂g → ¹E_g

³A₂g → ¹A₂g

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The experimental magnetic moment (3.4 BM) of a hydrated salt of Eu³⁺ at 27 °C is significantly different from the calculated value. The difference is due to (Given: atomic number of Eu is 63)

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population of electrons at higher J level(s) via thermal excitation.

strong ligand field splitting of f-orbitals.

strong spin-orbit coupling.

pairing of electrons in f-orbitals.

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The CORRECT combination of L1 and L2 among H⁻, NO⁻, MeCH²⁻ and CO, that will satisfy the 18 electron rule for both metal centers in the following neutral molecule, is: