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

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Question 1 of 20

Chemistry

1. How many resonance structures of benzene are known

1.3

2.5

3.2

4.7

Question 1 of 20

Question 2 of 20

2. The electrophile in aromatic sulphonation is?

1.H2SO4

2.SO3

3.HSO4-

4.SO3 +

Question 2 of 20

Question 3 of 20

3. 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 3 of 20

Question 4 of 20

4. In which compound benzene rings are isolated?

1.Naphtalene

2.Phenathracene

3.Diphenyl methane

4.Anthracene

Question 4 of 20

Question 5 of 20

5. The structure of Benzene is?

1.Hexagonal planner

2.Tetrahedral

3.Hexagonal irregular

4.Trigonal planner

Question 5 of 20

Question 6 of 20

6. The benzene molecule contains?

1.One double bond

2.Delocalized pi-electron charge

3.Three double bonds

4.Two double bonds

Question 6 of 20

Question 7 of 20

7. Aromatic compounds burn with sooty flame because?

1.They resist reaction with air

2.They have a ring structure

3.They have high percentage of hydrogen

4.They have high percentage of carbon

Question 7 of 20

Question 8 of 20

8. Which compound is the most reactive one?

1.Ethane

2.None of them

3.Benzene

4.ethyne

Question 8 of 20

Question 9 of 20

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

1.Benzene

2.Toluene

3.Chlorobenzene

4.Nitrobenzene

Question 9 of 20

Question 10 of 20

10. C - C bond length in Benzene is?

1.1.20 A

2.1.34A

3.1.54 A

4.1.39 A

Question 10 of 20

Question 11 of 20

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

1.AlCl3

2.BeCl2

3.HNO3

4.NaCI

Question 11 of 20

Question 12 of 20

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

1.Isomerization

2.Dealkylation

3.Rearrangement

4.Aromatization

Question 12 of 20

Question 13 of 20

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

1.12

2.3

3.18

4.6

Question 13 of 20

Question 14 of 20

14. Molecule of benzene contains?

1.Delocalized pi-electron charge

2.Two double bonds

3.One double bond

4.Three double bonds

Question 14 of 20

Question 15 of 20

15. Benzene cannot undergo?

1.Addition reactions

2.Substitution reactions

3.Oxidation reactions

4.Elimination reactions

Question 15 of 20

Question 16 of 20

16. Resonance energy of benzene is?

1.145Kj/mole

2.140.5 Kj/mole

3.155Kj/mole

4.150.5 Kj/mole

Question 16 of 20

Question 17 of 20

17. Aromatic hydrocarbons are the derivatives of?

1.Normal series of paraffin

2.Alkene

3.Benzene

4.Cyclohexane

Question 17 of 20

Question 18 of 20

18. Aromatic hydrocarbons are the derivatives of?

1.Normal series of Paraffins

2.Benzene

3.Alkene

4.Cyclohexane

Question 18 of 20

Question 19 of 20

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

1.NO3

2.NO2+

3.NO2-

4.HNO3

Question 19 of 20

Question 20 of 20

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

1.That it gives addition reactions

2.Large delocalization of pi - electrons

3.That it has three alternate single and double bonds

4.Cyclic structure

Question 20 of 20

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