Chemistry
GATE CY format:mcq PYQs
Build your understanding with focused practice from past exam papers.
Questions 81–90 of 394. Imported answers require independent review unless marked reviewed.
Question 18
Open questionCYMCQ1 markNeeds review
Critical micellar concentration of a surfactant is 0.008 M in water at 25 °C. If the aggregation number of the micelles is 80, the concentration of the micelles (in M) present in 0.088 M aqueous solution of the surfactant at 25 °C is
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The order and the number of classes present in a group with the irreducible representations A₁, A₂, B₁, B₂, E₁, and E₂, are, respectively,
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The molecule XY₂ is microwave active and its vibration-rotation spectrum shows only P and R transitions. In the correct structure,
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Open questionCYMCQ2 marksNeeds review
Borax on treatment with NaOH and H₂O₂ forms X. The compound X on reaction with PhCN at 60 °C in methanol-water mixture gives Y as the major product. X and Y, respectively, are
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Open questionCYMCQ2 marksNeeds review
In the EPR spectrum of an aqueous solution of VSO₄ at room temperature, the total number of hyperfine splitting signals is
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Open questionCYMCQ2 marksNeeds review
The hapticity of allyl and Cp and the ligation mode of NO in the thermodynamically stable complexes [(ηˣ-allyl)Ru(CO)₂(NO)] and [(ηʸ-Cp)Ru(CO)₂(NO)], respectively, are (The hapticity of allyl and Cp are denoted by ηˣ and ηʸ, respectively.)
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Open questionCYMCQ2 marksNeeds review
In the following reactions, the structures of I, II, and III, respectively, are
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Open questionCYMCQ2 marksNeeds review
Consider the following
H-NMR (400 MHz, DMSO-d
) data of a compound:
in ppm: 3.85 (s, 6H), 6.73 (t, J = 2.2 Hz, 1H), 7.1 (d, J = 2.2 Hz, 2H), and 13.05 (brs, 1H).The compound is
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Open questionCYMCQ2 marksNeeds review
Fischer presentation of D-(-)-fructose is given below.
The correct structure of
-L-(+)-fructofuranose isYour answerChoose one option.
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Open questionCYMCQ2 marksNeeds review
The major products X and Y in the following reaction sequence are
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