Hydrocarbons Test

Result

Hydrocarbons Test - 20

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Weekly Quiz Competition

Question 1
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Direction (Q. Nos. 1 - 10) This is section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d) out of which ONLY ONE option is correct.
Q. The electrophile in sulphonation of benzene using fuming sulphuric acid is

A
SO₂

B
SO₃

C

D

Solution

The correct answer is Option B.
Fuming sulphuric acid, H₂S₂O₇, can be thought of as a solution of SO₃ in sulphuric acid - and so is a much richer source of the SO₃. Sulphur trioxide is an electrophile because it is a highly polar molecule with a fair amount of positive charge on the sulphur.
Question 2
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In nitration of benzene using cone. H₂SO₄ and cone. HNO₃, the role of nitric acid is

A
an acid

B
a base

C
a reducing agent

D
an oxidising agent

Solution

The correct answer is Option B.
Nitration is electrophilic substitution reaction; in its first step HNO3 takes protons from sulphuric acid and then forms −NO2+ so here HNO3 acts as base.

Mechanism of reaction as shown
Question 3
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The increasing order of reactivity of the following compounds towards electrophilic aromatic substitution reaction is

A
I < II < III < IV

B
IV < III < II < I

C
II < IV < I < III

D
I < IV < III < I
Question 4
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What is the correct increasing order of reactivity of the following compounds towards electrophilic aromatic substitution reaction?

A
I < II < III < IV

B
IV < III < II < I

C
IV < III < I < II

D
Ill < IV < I < II

Solution

The correct answer is option B
Question 5
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What is major product of the reaction below?

A

B

C

D

Solution

The correct answer is option D
Question 6
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Predict major product of the following reaction.

A

B

C

D
Question 7
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Which of the following act as electrophile in halogenation?

A
Nitronium ion

B
Sulphonium ion

C
Halonium ion

D
Acylium ion

Solution

Halonium ion act as electrophile in halogenation. Nitronium ion is used in nitration. Sulphonium ion is used in sulphonation. Acylium ion is used in acylation.
Question 8
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Identify the correct order of reactivity of following towards aromatic electrophilic substitution reaction.
I. Toluene
II. Benzene
III. Chlorobenzene
IV. Nitrobenzene

A
IV < III < II < I

B
IV < II < I < III

C
IV < III < I < II

D
IV < I < III < II

Solution

The correct answer is Option A
Toluene is having one methyl group which is an electron-donating group causing a negative charge on the carbon atom of the ring so it is highly reactive towards electrophile which is already electron deficient.
Benzene has a delocalised set of electron clouds which attracts electrophile while chloro and nitro group are electronegative causing positive charge on carbon atoms so are not reactive towards electrophilic substitution.
Cl shows -I effect and −NO₂ shows a strong electron-withdrawing effect. So least reactive
a)IV < III < II < I
Question 9
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Predict the major product in the following reaction.
[IIT JEE 2001]

A

B

C

D
Question 10
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What is true about sulphonation of C₆H₆?

A
Cone. H₂SO₄ is boiling condition brings about sulphonation

B
SO₃ is electrophile in sulphonation reaction

C
Sulphonation reaction is reversible in nature

D
All of the above