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.H2SO4

2.SO3 +

3.SO3

4.HSO4-

Question 1 of 20

Question 2 of 20

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

1.That it gives addition reactions

2.Cyclic structure

3.Large delocalization of pi - electrons

4.That it has three alternate single and double bonds

Question 2 of 20

Question 3 of 20

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

1.BeCl2

2.NaCI

3.AlCl3

4.HNO3

Question 3 of 20

Question 4 of 20

4. Aromatic hydrocarbons are the derivatives of?

1.Alkene

2.Cyclohexane

3.Benzene

4.Normal series of Paraffins

Question 4 of 20

Question 5 of 20

5. The structure of Benzene is?

1.Tetrahedral

2.Hexagonal planner

3.Trigonal planner

4.Hexagonal irregular

Question 5 of 20

Question 6 of 20

6. Aromatic compounds burn with sooty flame because?

1.They have high percentage of hydrogen

2.They resist reaction with air

3.They have a ring structure

4.They have high percentage of carbon

Question 6 of 20

Question 7 of 20

7. In which compound benzene rings are isolated?

1.Diphenyl methane

2.Phenathracene

3.Naphtalene

4.Anthracene

Question 7 of 20

Question 8 of 20

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

1.Chlorobenzene

2.Nitrobenzene

3.Toluene

4.Benzene

Question 8 of 20

Question 9 of 20

9. Resonance energy of benzene is?

1.140.5 Kj/mole

2.150.5 Kj/mole

3.145Kj/mole

4.155Kj/mole

Question 9 of 20

Question 10 of 20

10. Benzene cannot undergo?

1.Elimination reactions

2.Addition reactions

3.Substitution reactions

4.Oxidation reactions

Question 10 of 20

Question 11 of 20

11. Molecule of benzene contains?

1.Delocalized pi-electron charge

2.Two double bonds

3.Three double bonds

4.One double bond

Question 11 of 20

Question 12 of 20

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

1.18

2.3

3.12

4.6

Question 12 of 20

Question 13 of 20

13. The benzene molecule contains?

1.One double bond

2.Delocalized pi-electron charge

3.Two double bonds

4.Three double bonds

Question 13 of 20

Question 14 of 20

14. How many resonance structures of benzene are known

1.2

2.7

3.3

4.5

Question 14 of 20

Question 15 of 20

15. Which compound is the most reactive one?

1.None of them

2.Ethane

3.ethyne

4.Benzene

Question 15 of 20

Question 16 of 20

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

1.Isomerization

2.Aromatization

3.Rearrangement

4.Dealkylation

Question 16 of 20

Question 17 of 20

17. C - C bond length in Benzene is?

1.1.39 A

2.1.54 A

3.1.34A

4.1.20 A

Question 17 of 20

Question 18 of 20

18. Aromatic compound give sooty flame because they?

1.Contain high percentage of Carbon

2.Have stable structure

3.Have (a cyclic structure)

4.Resist the reaction with air

Question 18 of 20

Question 19 of 20

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

1.HNO3

2.NO2+

3.NO2-

4.NO3

Question 19 of 20

Question 20 of 20

20. Aromatic hydrocarbons are the derivatives of?

1.Benzene

2.Cyclohexane

3.Alkene

4.Normal series of paraffin

Question 20 of 20

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