Chemistry 12 mcqs chapter 9

Download or Preview 2nd Year Chemistry MCQs With Answers Chapter 9 Aromatic compounds along with answers for both Entry Test and Board Exams.

IMPORTANCE OF THESE MCQS

It is tough and difficult task to solve 2nd year chemistry mcqs . Students must have proper preparation of 2nd year chemistry mcqs for excellent marks in chemistry 12. All the important mcqs related to chapter 5 of 2nd year Chemistry are here for you. These questions are taken from past papers of 2nd year chemistry of all Punjab Board of Pakistan as ;

Bahawalpur Board

D.G.Khan Board

Faisalabad Board

Gujranwala Board

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Rawalpindi Board

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These questions (MCQs) are top repetitive in previous papers. Each question has a detailed answer explanation. In this way you learn from your mistakes

Chemistry 12 Smart Preparation

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About This Chapter

Chapter no. 9 "Aromatic Compounds" of Chemistry class 12 enables the students to expert in nomenclature of aromatic hydrocarbons and their derivatives. Students learn Kekule and resonance approaches to explain the structure and stability of benzene. Students learn about the preparation of benzene and electrophilic substitution, oxidation and addition reactions of benzene. Students learn isomerism which arises when a second substituent enters the benzene ring. Students learn comparison of reactivities of alkanes, alkenes and benzene. This Post "Chemistry 12 mcqs chapter 9" covers all important mcqs that are top repetitive in past papers relevant to above mentioned topics.

👉For Answers of following questions click the show answer button.

1. The benzene molecule contains:

(A) One double bond

(B) Two double bond

(C) Three double bond

(D) Delocalized pi electrons

(D) Delocalized pi electrons

2. The resonating contributing of benzene is:

(A) 6

(B) 5

(C) 3

(D) 2

(B) 5

3. The structure of benzene is:

(A) Hexagonal irregular

(B) Hexagonal planer

(C) Tetragonal 

(D) Trigonal planer

(B) Hexagonal planer

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

(A) Isomerization

(B) Dealkylation

(C) Rearrangement

(D) Aromatization

(D) Aromatization

5. Carbon-carbon bond length in benzene is:

(A) 1.34A^o

(B) 1.20A^o

(C) 1.39A^o

(D) 1.54A^o

(C) 1.39A^o

6. Which compound is most reactive?

(A) Benzene

(B) Ethyne

(C) Ethene

(D) Ethane

(C) Ethene

7. Catalyst used in Friedel crafts reactions?

(A) AlCl₃

(B) HNO₃

(C) BeCl₂

(D) NaCl

(A) AlCl₃

8. Benzene can not undergo:

(A) Substitution reaction

(B) Oxidation reaction

(C) Addition reaction

(D) Elimination Reaction

(D) Elimination Reaction

9. During nitration of benzene the active nitrating agent is 

(A) NO₃

(B) NO₂⁺

(C) NO₂

(D) HNO₃

(B) NO₂⁺

10. Aromatic Hydrocarbons are derivatives of 

(A)  Paraffins

(B) Alkene

(C) Benzene

(D) Cyclohexane

(C) Benzene

11. The ratio of sigma and pi bond in benzen molecule is:

(A) 8

(B) 6

(C) 4

(D) 2

(C) 4

12. Which of the following compound is polycyclic?

(A)  Xylene

(B) Naphthalene

(C) Styrene

(D) Cumene

(B) Naphthalene

13. Which of the following is not an electrophile?

(A) BF₃

(B) AlCl₃

(C) ZnCl₂

(D) NH₃

(D) NH₃

14. A nucleophile must have overall:

(A) negative charge

(B) unpaired electron

(C) a lone pair of electron

(D) all of above

(D) all of above

15. Amongst the following, the compound that can be most readily sulphonated:

(A) Toluene

(B) Benzene

(C) Nitrobenzene

(D) Chlorobenzene

(A) Toluene

16. The electrophile in aromatic sulphonation is:

(A) HSO₄^-

(B) H₂SO₄

(C) SO₃

(D) SO₃H⁺

(D) SO₃H⁺

17. Aromatic compounds burn with sooty flame because:

(A) They have high % of C

(B) They have high % of H

(C) They have a ring structure

(D) They resist reaction with air

(A) They have high % of C

18. On oxidation in the presence of V2O5 benzene gives

(A) Maleic Anhydride

(B) Hexachlorobenzene

(C) O-Ethylotoulene

(D) None of above

(A) Maleic Anhydride

19.Michael Faraday discovered benzene in : 

(A) 1825

(B) 1850

(C) 1859

(D) 1833

(A) 1825

20. Which is recognized as the simplest member of the class aromatic hydrocarbons?

(A) Cyclohexane

(B) Benzene

(C) Ethene

(D) Ethyne

(B) Benzene

Visit Also >> Chemistry 12 Important Short & Long Qs PDF

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