GATE CY topic:pericyclic-reactions-photochemistry PYQs & Answers

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topic:pericyclic-reactions-photochemistry

Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.

Questions 1–10 of 16. Imported answers require independent review unless marked reviewed.

Topic practice 16 questionsPage 1 of 2

The correct statement about the intermediate formed in the following reaction is

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Diagram for Chemistry question 38 (figure 2)

is formed through conrotatory opening of X

Diagram for Chemistry question 38 (figure 3)

is formed through disrotatory opening of X

Diagram for Chemistry question 38 (figure 4)

is formed through conrotatory opening of X

Diagram for Chemistry question 38 (figure 5)

is formed through disrotatory opening of X

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The reaction(s) that produce(s) the following compound is(are)

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Diagram for Chemistry question 49 (figure 2)

Diagram for Chemistry question 49 (figure 3)

Diagram for Chemistry question 49 (figure 4)

Diagram for Chemistry question 49 (figure 5)

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On heating, the compound Z undergoes a series of 1,5-H/D shifts to give a mixture of its isomers. The total number of isomers present in the mixture (including Z) is ______ (in integer).

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Choose the correct option(s) with regard to mechanism of the following transformation.

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It proceeds through divinyl cyclopropane rearrangement.

It involves a diradical intermediate.

It proceeds through di-π-methane rearrangement.

It proceeds through [2+2+2] cycloaddition reaction.

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On irradiation using UV light (>300 nm), compounds X and Y, predominately, undergo

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X: Norrish type I reaction and Y: Norrish type II reaction

X: Norrish type II reaction and Y: Norrish type I reaction

Both X and Y: Norrish type I reaction

Both X and Y: Norrish type II reaction

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E and F in the given reaction scheme are

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The major product M in the following reaction is

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Diagram for Chemistry question 15 (figure 2)

Diagram for Chemistry question 15 (figure 3)

Diagram for Chemistry question 15 (figure 4)

Diagram for Chemistry question 15 (figure 5)

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The major product formed in the following reaction [a substituted alcohol-containing bicyclic substrate treated with (i) NOCl, (ii) hν, (iii) HCl] is: