PPSC Lecturer Chemistry Test 39 Online Preparation MCQs

Leave a Comment / By Hassan / May 23, 2021

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.

Note:-

There will be 25 multiple choice question in the test.
Answer of the questions will change randomly each time you start this test.
Practice this test at least 5 times if you want to secure High Marks.
At the End of the Test you can see your Test score and Rating.
If you found any incorrect answer in Quiz. Simply click on the quiz title and comment below on that MCQ. So that I can update the incorrect answer on time.

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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

The carbon atoms in a benzene ring are :

None of these

sp hybridized

sp2 hybridized

sp3 hybridized

2 / 25

Which of the following statements is incorrect about benzene?

All twelve atoms lie in the same plane.

The carbon-carbon bond lengths are all the same.

It has delocalized electrons.

All of the carbon atoms are sp hybridized.

3 / 25

Which of the following statements about benzene is correct?

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

It is a planar molecule.

It has no delocalized electrons.

All of the carbon atoms are sp3 hybridized.

4 / 25

Aromatic molecules contain __________ π electrons.

4n (with n an integer)

4n + 2 (with n being 0.5)

4n + 2 (with n being an integer)

5 / 25

Aromatic hydrocarbons are also called :

Alkoxy compounds

Arenes

Huckel's compounds

Trienes

6 / 25

For reactions of ethylbenzene, the ethyl group is considered :

meta director

ortho director

ortho-meta director

ortho-para director

7 / 25

Which of the following is aromatic?

cycloheptatrienyl cation

1,3-cyclohexadiene

cyclopentadienyl cation

cyclobutenyl anion

8 / 25

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

cis-trans isomers

constitutional isomers

conformational isomers

keto-enol tautomers

9 / 25

Characteristic reactions of aromatic hydrocarbons are initiated by

Uncharged molecules

Electrophiles

Free radicals

Nucleophiles

10 / 25

The C–C bond length in benzene is

shorter than the C–C bond length in ethylene.

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

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

greater than the C–C bond length in ethane.

11 / 25

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

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

Benzene functions as a nucleophile.

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

The addition product is a frequently observed minor product.

12 / 25

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

CH3Cl in the presence of AlCl3

CH3COCl in the presence of AlCl3

Chlorine in the presence of uv light

Hydrogen in the presence of nickel

13 / 25

Which of the following statements are false about benzene?

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

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°.

14 / 25

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

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

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

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

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

15 / 25

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

sp2

16 / 25

Which of the following statements are correct concerning benzene?

(a) and (b)

The six carbon-carbon bonds have the same length.

Benzene is a planar molecule.

17 / 25

Which statement about the structure of benzene is not true?

The molecular geometry of benzene is best described as planar.

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

The two Kekule structures of benzene are in equilibrium.

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

18 / 25

Coal-tar is the main source of :

Aromatic compounds

Heterocyclic compounds

None of these

Aliphatic compounds

19 / 25

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

The benzene ring attacks an acylium ion.

An alkyl group substitutes for a hydrogen.

The acylium ion is resonance stabilized.

The acylium ion is often produced from an acyl chloride.

20 / 25

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

Anthracene oil

Middle oil

Light oil

Heavy oil

21 / 25

Phenol on distillation with Zinc dust gives

Cyclohexanone

Benzene

Benzoic acid

Phenylzinc

22 / 25

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

Ethylbenzene

o-Xylene

m-Xylene

Chlorobenzene

23 / 25

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

Benzoyl bromide

Benzyl bromide

m-Bromotoluene

o-Bromotoluene

24 / 25

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

n-butylbenzene

chlorobenzene

isobutylbenzene

tert-butylbenzene

25 / 25

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

Anthracene oil

Middle oil

Light oil

Heavy oil

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PPSC Lecturer Chemistry Test 39 Online Preparation MCQs

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