GATE CY Reaction Mechanisms PYQs & Answers — Exam Papers

Home
GATE
Chemistry
Topics
Reaction Mechanisms

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

Among the given options, the possible product(s) that can be obtained from the following reaction is/are

Diagram for Chemistry question 26

Your answerSelect all correct options. You can choose more than one.

A.

Diagram for Chemistry question 26 (figure 2)

B.

Diagram for Chemistry question 26 (figure 3)

C.

Diagram for Chemistry question 26 (figure 4)

D.

Diagram for Chemistry question 26 (figure 5)

Log in to check the answer

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Consider the following two reactions and their corresponding Hammett plots

Diagram for Chemistry question 52

Reaction M: Ar–C(CH₃)₂Cl →[S_N1, slow, kₓ] Ar–C⁺(CH₃)₂ →[H₂O, kₓ] Ar–C(CH₃)₂OH Reaction N: Ar–COOEt + OH⁻ →[H₂O, kₓ] Ar–COO⁻ + EtOH

Choose the option(s) that correctly match(es) the points on the graph given in Column-I with substituents X given in Column-II in accordance with their substituents constant σ

Your answerSelect all correct options. You can choose more than one.

A.

s → σ_(X = Cl); t → σ_(X = OMe); u → σ_(X = NH₂); r → σ_(X = NO₂)

B.

s → σ_(X = Me); u → σ_(X = NH₂); t → σ_(X = OMe); r → σ_(X = Br)

C.

p → σ_(X = Me); q → σ_(X = CN); r → σ_(X = NO₂); t → σ_(X = OMe)

D.

p → σ_(X = Cl); q → σ_(X = NO₂); r → σ_(X = CN); t → σ_(X = Me)

Log in to check the answer

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The process(es) and/or intermediate(s) through which the following transformation proceeds is/are

Diagram for Chemistry question 54

Your answerSelect all correct options. You can choose more than one.

A.

1,2-methide shift

B.

1,3-methide shift

C.

non-classical carbocation

D.

tertiary carbocation

Log in to check the answer

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

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

Diagram for Chemistry question 42

Your answerChoose one option.

A.

Diagram for Chemistry question 42 (figure 2)

B.

Diagram for Chemistry question 42 (figure 3)

C.

Diagram for Chemistry question 42 (figure 4)

D.

Diagram for Chemistry question 42 (figure 5)

Log in to check the answer

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The correct statement(s) regarding P, Q, R, and S is (are):

Diagram for Chemistry question 52

Your answerSelect all correct options. You can choose more than one.

A.

P reacts faster than Q with PhSNa in DMF as a solvent.

B.

Q reacts faster than P with NaN₃ in DMF as a solvent.

C.

R reacts faster than S when treated with TsCl/Et₃N in DCM as a solvent.

D.

R gets oxidized faster than S when reacted with CrO₃ in DCM as a solvent.

Log in to check the answer

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The rates of alkaline hydrolysis of the compounds shown below are compared. The compounds are labeled I, II, and III. They follow the order:

Diagram for Chemistry question 1

Your answerChoose one option.

A.

I > II > III

B.

II > I > III

C.

II > III > I

D.

III > I > II

Log in to check the answer

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The major product formed in the following reaction

Diagram for Chemistry question 30

is:

Your answerChoose one option.

A.

non-6-yn-2-one

B.

non-3-yn-8-one

C.

non-2-yn-6-one

D.

non-3-en-8-one

Log in to check the answer

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The major product formed in the following reaction

Diagram for Chemistry question 31

is:

Your answerChoose one option.

A.

Diagram for Chemistry question 31 (figure 2)

B.

Diagram for Chemistry question 31 (figure 3)

C.

Diagram for Chemistry question 31 (figure 4)

D.

Diagram for Chemistry question 31 (figure 5)

Log in to check the answer

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Among the following

Diagram for Chemistry question 35

the compounds which can be prepared by nucleophilic substitution reaction are:

Your answerChoose one option.

A.

III, IV, and V

B.

I, II, and VI

C.

II, IV, and VI

D.

I, III, and V

Log in to check the answer

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The major product formed in the reaction of (2R,3R)-2-bromo-3-methylpentane with NaOMe is:

Your answerChoose one option.

A.

(Z)-3-methylpent-2-ene

B.

(E)-3-methylpent-2-ene

C.

(2R,3R)-2-methoxy-3-methylpentane

D.

(2S,3R)-2-methoxy-3-methylpentane

Log in to check the answer

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer