GATE CY topic:organic-synthesis PYQs & Answers — Page 12

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topic:organic-synthesis

Questions 111–116 of 116. Imported answers require independent review unless marked reviewed.

Topic practice 116 questionsPage 12 of 12

In the two step reaction sequence given below, the starting bis-sulfone acts as

Your answerChoose one option.

a dienophile and synthetic equivalent of acetylene

a dienophile and synthetic equivalent of ethylene

a dipolarophile and synthetic equivalent of acetylene

a dipolarophile and synthetic equivalent of ethylene

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The major product formed in the following reaction is

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Diagram for Chemistry question 46 (figure 2)

Diagram for Chemistry question 46 (figure 3)

Diagram for Chemistry question 46 (figure 4)

Diagram for Chemistry question 46 (figure 5)

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The structures of the intermediate [P] and major product Q formed in the following reaction sequence are

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Diagram for Chemistry question 51 (figure 2)

Diagram for Chemistry question 51 (figure 3)

Diagram for Chemistry question 51 (figure 4)

Diagram for Chemistry question 51 (figure 5)

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Hydroboration of 2-butyne with

yields the intermediate U, which on treatment with I

and NaOMe at

, gives product V. The structures of U and V are

Your answerChoose one option.

U and V structures shown

U and V structures shown

Diagram for Chemistry question 53 (figure 2)

U and V structures shown

Diagram for Chemistry question 53 (figure 3)

U and V structures shown

Diagram for Chemistry question 53 (figure 4)

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The structures of the major products W and X in the following synthetic scheme are

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W and X structures shown

Diagram for Chemistry question 54 (figure 2)

W and X structures shown

Diagram for Chemistry question 54 (figure 3)

W and X structures shown

Diagram for Chemistry question 54 (figure 4)

W and X structures shown

Diagram for Chemistry question 54 (figure 5)

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The major products Y and Z in the following reaction sequence are

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Y =

Diagram for Chemistry question 55 (figure 2)

; Z =

Diagram for Chemistry question 55 (figure 3)

Y =

Diagram for Chemistry question 55 (figure 4)

; Z =

Diagram for Chemistry question 55 (figure 5)

Y =

Diagram for Chemistry question 55 (figure 6)

; Z =

Diagram for Chemistry question 55 (figure 7)

Y =

Diagram for Chemistry question 55 (figure 8)

; Z =

Diagram for Chemistry question 55 (figure 9)

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GATE CY topic:organic-synthesis PYQs

Question 22

Question 46

Question 51

Question 53

Question 54

Question 55