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Test: Reaction Mechanism Level - 6

24 Questions MCQ Test Organic Chemistry | Test: Reaction Mechanism Level - 6

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Attempt Test: Reaction Mechanism Level - 6 | 24 questions in 50 minutes | Mock test for Chemistry preparation | Free important questions MCQ to study Organic Chemistry for Chemistry Exam | Download free PDF with solutions

*Multiple options can be correct

QUESTION: 1

Which of the following statement(s) is/are true about the reaction given below:

(1) it involves a carbocation intermediate
(2) rearrangement is due to S_N1 reaction mechanism.
(3) it proceeds via a concerted S_N2 pathway
(4) it involves neighbouring group participation.

A.
(1) only
B.
(1) and (4) only
C.
(2) and (4) only
D.
All of the above

Solution:

From above mechanism:
If proceecs via a concerted S_N2 pathway.
It involves neighbouring group participation.

*Multiple options can be correct

QUESTION: 2

The reaction (s) which give (s) phenol is/are:

Solution:

*Multiple options can be correct

QUESTION: 3

Compound(s) that on hydrogenation product(s) optically inactive compound(s) is(are):

Solution:

*Multiple options can be correct

QUESTION: 4

When 20 g of a compound (A) (M.F. = C₄H₁₀O₄) reacts with excess of CH₃MgBr, 14.6 L of CH₄ is obtained at STP. What is structural formula of (A)?

Solution:

*Multiple options can be correct

QUESTION: 5

In the following reaction, the product(s) formed is (are)

A.
P (major)
B.
Q (minor)
C.
R (minor)
D.
S (major)

Solution:

*Multiple options can be correct

QUESTION: 6

The major product(s) of the following reaction is (are):

Solution:

*Multiple options can be correct

QUESTION: 7

Which of the following ethers can be synthesized directly by Williamson’s synthesis:

Solution:

*Multiple options can be correct

QUESTION: 8

Among P, Q, R and S the aromatic compound(s) is/are:

Solution:

*Multiple options can be correct

QUESTION: 9

The correct statement(s) about the following reaction sequence is/are:

A.
R is steam volatile
B.
Q gives dark violet coloration with 1% aqueous FeCl₃ solution
C.
S gives yellow precipitate with 2, 4-dinitrophynylhydrazine
D.
S gives dark violet coloration with 1% aqueous FeCl₃ solution

Solution:

*Multiple options can be correct

QUESTION: 10

For the following compounds, the correct statement(s) with respect to nucleophile substitution reaction is(are):

A.
I and III follow S_N1 mechanism
B.
Compound IV undergoes inversion of configuration
C.
I and II follow S_N2 mechanism
D.
The order of reactivity for I, III and IV is IV > I > III

Solution:

*Multiple options can be correct

QUESTION: 11

Compounds P and R upon ozonolysis produce Q and S, respectively. The molecular formula of Q and S is C₈H₈O. Q undergoes Cannizzaro reaction but not Haloform reaction, whereas S undergoes Haloform reaction but no Cannizzaro reaction.

The option(s) with suitable combination of P and R, respectively, is(are)

Solution:

The options (A) and (B) are with suitable combination of P and R, respectively.
When no alpha H atom is present, aldehyde will undergo Cannizzaro reaction. When alpha H atom is present, aldehyde will not undergo Cannizzaro reaction. If it is a methyl ketone, it will undergo haloform reaction.
If it is not a methyl ketone, it will not undergo haloform reaction.
In options (C) and (D), the product on ozonolysis is not having molecular formula C8H8O .

*Multiple options can be correct

QUESTION: 12

The reactivity of compound Z with different halogens under appropriate conditions is given below:

The observed pattern of electrophilic substitution can be explained by:

A.
The Steric effect of the halogen
B.
The Steric effect of the tert-butyl group
C.
The electronic effect of the phenolic group
D.
The electronic effect of the tert-butyl group

Solution:

*Multiple options can be correct

QUESTION: 13

In the reaction shown below, the major product(s) formed is/are:

Solution:

QUESTION: 14

Choose the correct one which will react faster in the SN2 nucleophilic substitution reaction?

A.
CH2 – CH = CH2 = Br
B.
CH2 = CH – CH2 – Br
C.
CH2 = CH – CH2 = Br
D.
CH = CH2 – CH2 – Br

Solution:

Ans: b

Explanation: The carbocation character in the transition state causes stabilization of the resonance and hence CH2 = CH – CH2 – Br (2-bromobutane) is the one which will react faster compared to the others.

*Multiple options can be correct

QUESTION: 15

Which of the following compound gives even number of Hoffmann’s exhaustive methylation and elimination?