Punjab 12th Class Chemistry Chapter 9 Aromatic Hydrocarbons MCQs Test Online

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Question 1 of 20

Chemistry

1. The electrophile in aromatic sulphonation is?

1.HSO4-

2.SO3

3.SO3 +

4.H2SO4

Question 1 of 20

Question 2 of 20

2. Aromatic compounds burn with sooty flame because?

1.They have a ring structure

2.They resist reaction with air

3.They have high percentage of hydrogen

4.They have high percentage of carbon

Question 2 of 20

Question 3 of 20

3. The structure of Benzene is?

1.Hexagonal irregular

2.Hexagonal planner

3.Trigonal planner

4.Tetrahedral

Question 3 of 20

Question 4 of 20

4. Aromatic hydrocarbons are the derivatives of?

1.Normal series of paraffin

2.Alkene

3.Cyclohexane

4.Benzene

Question 4 of 20

Question 5 of 20

5. Resonance energy of benzene is?

1.145Kj/mole

2.155Kj/mole

3.150.5 Kj/mole

4.140.5 Kj/mole

Question 5 of 20

Question 6 of 20

6. Amongst the following, the compound that can be most readily sulphonated is?

1.Toluene

2.Nitrobenzene

3.Chlorobenzene

4.Benzene

Question 6 of 20

Question 7 of 20

7. C - C bond length in Benzene is?

1.1.34A

2.1.39 A

3.1.54 A

4.1.20 A

Question 7 of 20

Question 8 of 20

8. The extra-ordinary stability of benzene molecule is due to?

1.That it has three alternate single and double bonds

2.That it gives addition reactions

3.Large delocalization of pi - electrons

4.Cyclic structure

Question 8 of 20

Question 9 of 20

9. Molecule of benzene contains?

1.Delocalized pi-electron charge

2.Three double bonds

3.One double bond

4.Two double bonds

Question 9 of 20

Question 10 of 20

10. Total number of it -electrons in benzene are?

1.18

2.3

3.6

4.12

Question 10 of 20

Question 11 of 20

11. How many resonance structures of benzene are known

1.7

2.5

3.2

4.3

Question 11 of 20

Question 12 of 20

12. The benzene molecule contains?

1.Two double bonds

2.Delocalized pi-electron charge

3.Three double bonds

4.One double bond

Question 12 of 20

Question 13 of 20

13. Aromatic compound give sooty flame because they?

1.Have (a cyclic structure)

2.Resist the reaction with air

3.Have stable structure

4.Contain high percentage of Carbon

Question 13 of 20

Question 14 of 20

14. Which compound is the most reactive one?

1.None of them

2.Benzene

3.Ethane

4.ethyne

Question 14 of 20

Question 15 of 20

15. The conversion of n-hexane into benzene by heating in the presence of Pt is called?

1.Rearrangement

2.Aromatization

3.Isomerization

4.Dealkylation

Question 15 of 20

Question 16 of 20

16. Benzene cannot undergo?

1.Substitution reactions

2.Oxidation reactions

3.Addition reactions

4.Elimination reactions

Question 16 of 20

Question 17 of 20

17. Which of the following acid can be used as a catalyst in Friedel-Crafts reactions?

1.NaCI

2.BeCl2

3.AlCl3

4.HNO3

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Question 18 of 20

18. During nitration of benzene, the active nitrating agent is?

1.HNO3

2.NO2-

3.NO2+

4.NO3

Question 18 of 20

Question 19 of 20

19. In which compound benzene rings are isolated?

1.Diphenyl methane

2.Phenathracene

3.Naphtalene

4.Anthracene

Question 19 of 20

Question 20 of 20

20. Aromatic hydrocarbons are the derivatives of?

1.Benzene

2.Alkene

3.Normal series of Paraffins

4.Cyclohexane

Question 20 of 20

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