May 23, 2021 |

PPSC Lecturer Chemistry Test 39 Online Preparation MCQs

Given below on this Website Online Free Taleem is free online MCQ’s test related to PPSC of Lecturer Chemistry. All the individuals who are going to appear in PPSC Lecturer of Chemistry written test can attempt these tests in order to prepare for it in best possible way. Our tests include all the important questions MCQs of Lecturer of PPSC Chemistry, all Past Papers of Lecturer of Chemistry PPSC that have extremely high amount of chances for been included in the actual exam which make our test undoubtedly the best source of preparation.

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There will be 25 multiple choice question in the test.
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Test Instructions:-
Test Name	Lecturer Chemistry
Subject	Chemistry Test 39
Test Type	MCQs
Total Questions	25
Total Time	20 Minutes
Total Marks	100

You have 20 minutes to pass to the quiz.

PPSC LECTURER OF CHEMISTRY TEST NO. 39

1 / 25

Coal-tar is the main source of :

Aliphatic compounds

Heterocyclic compounds

Aromatic compounds

None of these

2 / 25

What is the major organic product of the reaction between benzene and isobutyl chloride in the presence of AlCl3?

isobutylbenzene

chlorobenzene

tert-butylbenzene

n-butylbenzene

3 / 25

What purpose does FeCl3 serve in the electrophilic aromatic substitution reaction between chlorine and benzene?

It functions by destabilizing the carbocationic intermediate and thereby increases the rate of H+ loss.

It serves as a radical initiator to produce the chlorine radical needed to propagate the chain reaction.

It serves as a Lewis base catalyst by reacting with Cl2 to generate chloride ions.

It serves as a Lewis acid catalyst by reacting with the Cl2 and thereby activates it toward attack by benzene’s π electrons.

4 / 25

Characteristic reactions of aromatic hydrocarbons are initiated by

Electrophiles

Nucleophiles

Uncharged molecules

Free radicals

5 / 25

Which of the following can be made by the action of CH3Cl on benzene in the presence of aluminium chloride?

Chlorobenzene

o-Xylene

m-Xylene

Ethylbenzene

6 / 25

Toluene reacts with bromine in the presence of uv light to give

m-Bromotoluene

Benzoyl bromide

o-Bromotoluene

Benzyl bromide

7 / 25

Which of the following is aromatic?

cyclopentadienyl cation

cyclobutenyl anion

cycloheptatrienyl cation

1,3-cyclohexadiene

8 / 25

Which of the following is not a correct statement about the electrophilic substitution mechanism of benzene?

Benzene functions as a nucleophile.

The addition product is a frequently observed minor product.

The carbocation intermediate contains an sp3 hybridized carbon in the ring.

Formation of a carbocation intermediate is the rate-determining step.

9 / 25

Which statement about the structure of benzene is not true?

The stability of benzene ring is much greater than the stability of 1,3,5- cycloheptatriene.

The carbon-carbon bond lengths in benzene are greater than the carbon-carbon double bonds in aliphatic compounds.

The two Kekule structures of benzene are in equilibrium.

The molecular geometry of benzene is best described as planar.

10 / 25

Which of the following statements about benzene is correct?

The carbon-carbon bond length is longer than that of ethane.

It has no delocalized electrons.

It is a planar molecule.

All of the carbon atoms are sp3 hybridized.

11 / 25

Which of the following fractions of coal-tar distillation contains benzene?

Anthracene oil

Middle oil

Light oil

Heavy oil

12 / 25

The C–C bond length in benzene is

shorter than the C–C bond length in ethylene.

intermediate between C–C bond length in ethane and C–C bond length in ethylene.

Same as that of C–C bond length in ethylene.

greater than the C–C bond length in ethane.

13 / 25

Aromatic hydrocarbons are also called :

Trienes

Alkoxy compounds

Arenes

Huckel's compounds

14 / 25

The carbon atoms in a benzene ring are :

sp2 hybridized

None of these

sp3 hybridized

sp hybridized

15 / 25

Aromatic molecules contain __________ π electrons.

4n + 2 (with n being an integer)

4n (with n an integer)

4n + 2 (with n being 0.5)

16 / 25

What is the term used for isomers that are in rapid equilibrium?

conformational isomers

cis-trans isomers

keto-enol tautomers

constitutional isomers

17 / 25

The delocalized π system in benzene is formed by a cyclic overlap of 6 orbitals.

sp2

18 / 25

Which of the following statements are false about benzene?

It can be converted into cyclohexane by hydrogenation at 200°C in the presence of Ni catalyst.

It is a planar molecule with bond angles 120°.

It reacts with ethyl chloride in the presence of aluminium chloride to form ethylbenzene.

It is a planar molecule with bond angles 120°.

19 / 25

Which of the following reagents will react with methyl group rather than the benzene ring in methylbenzene?

CH3Cl in the presence of AlCl3

Hydrogen in the presence of nickel

Chlorine in the presence of uv light

CH3COCl in the presence of AlCl3

20 / 25

Which of the following statements is incorrect about benzene?

The carbon-carbon bond lengths are all the same.

All of the carbon atoms are sp hybridized.

It has delocalized electrons.

All twelve atoms lie in the same plane.

21 / 25

Which of the following statements are correct concerning benzene?

The six carbon-carbon bonds have the same length.

Benzene is a planar molecule.

(a) and (b)

22 / 25

Which of the following is not a correct statement concerning the Friedel- Crafts acylation of benzene?

The acylium ion is resonance stabilized.

The acylium ion is often produced from an acyl chloride.

The benzene ring attacks an acylium ion.

An alkyl group substitutes for a hydrogen.

23 / 25

For reactions of ethylbenzene, the ethyl group is considered :

ortho-meta director

ortho director

ortho-para director

meta director

24 / 25

Phenol on distillation with Zinc dust gives

Benzoic acid

Benzene

Cyclohexanone

Phenylzinc

25 / 25

Which of the following fractions of coal-tar distillation contains naphthalene?

Light oil

Heavy oil

Anthracene oil

Middle oil

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