12th Class Chemistry Chapter 09 MCQs with Answers

Welcome to the 12th Class Chemistry Chapter 09 MCQs Online Test. We are presenting you with top MCQ questions from the 12th Class Chemistry Chapter Hydrocarbons.

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12th Class Chemistry Chapter 09 MCQs with Answers

Youth For Pakistan has provided an excellent opportunity for the students of the 12th class to prepare their Chemistry Chapter 09 Hydrocarbons online with MCQs test.

This is a free platform for students to prepare for Chemistry Exams for Class 12 to get the best accomplishments in annual exams. 12th class Students can analyze themself by attempting this online test system as many times as they want until they find themself fully prepared.

MCQs Class 12 Chemistry with Answers

The purpose of these online MCQs tests is to help you evaluate your 12th Class Chemistry Chapter 09 MCQs. These Multiple Choice Questions (MCQs) will prepare you for your academic success in the 12th Class Exams. 12th Class Chemistry Chapters include Chapter 1 Periodic Classification Of Elements & Periodicity, Chapter 2 S-block Elements, Chapter 3 Group lll A And Group IVA Elements, Chapter 4 Group VA And VIA Elements, Chapter 5 Halogens And Noble Gases, Chapter 6 Transition element, Chapter 7 Fundamental Principles Of Organic Chemistry, Chapter 8 Aliphatic Hydrocarbons, Chapter 9 Hydrocarbons, Chapter 10 Alkyl Halide, Chapter 11 Alcohols Phenols And Ethers, Chapter 12 Aldehydes & Ketones, Chapter 13 Carboxylic Acid, Chapter 14 Macromolecules, Chapter 15 Common Chemical Industries In Pakistan and Chapter 16 Environmental chemistry.

What is Hydrocarbons?

A hydrocarbon is any of a class of organic chemicals made up of only the elements carbon (C) and hydrogen (H). The carbon atoms join together to form the framework of the compound, and the hydrogen atoms attach to them in many different configurations. chemical compound. Learn more about chemical compounds.

Chapter No 9 Hydrocarbons

1. Which of the following acid can be used as a catalyst in Friedel Crafts reaction choose which one is correct:

  1. AlCl3
  2. HNO3
  3. BeCl2
  4. NaCl

2. During nitration of benzene, the active nitrating agent is choose which one is correct:

  1. NO3
  2. NO+2
  3. NO2
  4. HNO3

3. The electrophile in aromatic sulphonation is choose which one is correct:

  1. H2SO4
  2. HSO4
  3. SO+3
  4. SO3

4. Hydrogen to carbon ratio in aromatic hydrocarbons is choose which one is correct:

  1. Low
  2. High
  3. Equal
  4. None

5. The second substitution in benzene ring would give rise isomeric products choose which one is correct:

  1. One
  2. Two
  3. Three
  4. Four

6. Molecular mass of benzene is determined by choose which one is correct:

  1. Vapour density method
  2. X-ray diffraction
  3. Elemental analysis
  4. Degradation method

7. C − H bond lengths in benzene are choose which one is correct:

  1. 0.99 Å
  2. 1.09 Å
  3. 1.12 Å
  4. 1.397 Å

8. Each carbon in benzene ring is ⎯⎯⎯⎯ hybridized choose which one is correct:

  1. sp
  2. sp2
  3. Sp3
  4. None of these

9. On hydrogenation benzene liberates energy choose which one is correct:

  1. 358.5 kJ/mole
  2. 119 kJ-mol−1
  3. 208 kJ-mol−1
  4. 150.5 kJ-mol−1

10. The benzene ring is oxidized to maleic anhydride when strongly heated with choose which one is correct:

  1. Ni/200°C
  2. V2O5/450°C
  3. AlCl3/150°C
  4. Sunlight

11. Main source of aromatic compound is choose which one is correct:

  1. Petroleum
  2. Coal-tar
  3. Living organism
  4. Dead marine animals

12. When acetylene is heated at 300°C in Cu-tube, the product obtained is choose which one is correct:

  1. Benzene
  2. Thiophene
  3. Divinyl acetylene
  4. Xylene

13. Which one of the following species is ortho and para director choose which one is correct:

  1. CHO
  2. −SO3H
  3. −NO2
  4. Cl

14. The carbon-carbon bond distance in benzene choose which one is correct:

  1. 1.54°A
  2. 1.34°A
  3. 1.2°A
  4. 1.39°A

15. In toluene synthesis by Friedel Craft, the reactants in addition to anhydrous AlClare choose which one is correct:

  1. C6H+ CH4
  2. C6H5Cl
  3. C6H+ CH3Cl
  4. C6H5Cl + CH4

16. Benzophenone is also known as choose which one is correct:

  1. Biphenyl
  2. Dimethyl Ketone
  3. Diphenyl Ketone
  4. Methylphenyl Ketone

17. The no. of possible isomers of xylene are choose which one is correct:

  1. 2
  2. 3
  3. 4
  4. 5

18. The molecular formula of naphthalene is choose which one is correct:

  1. C10H8
  2. C10H10
  3. C10H12
  4. C12H12

19. Chlorine react with benzene in the presence of sunlight to give choose which one is correct:

  1. Chlorobenzene
  2. Benzoyl chloride
  3. Ortho-para dichlorobenzene
  4. Hexachlorobenzene

20. Effect of substituent on benzene ring is due to choose which one is correct:

  1. Resonance
  2. Inductive effect
  3. Both A. and (b)
  4. Unpredictable

21. In which of the following cases, the benzene rings are isolated choose which one is correct:

  1. Naphthalene
  2. Phenanthrene
  3. Anthracene
  4. Triphenylmethane

22. Benzene is stable than ethene because it has choose which one is correct:

  1. More π-bonds
  2. Localized π-electrons
  3. Delocalized π-electrons
  4. More σ-bonds

23. Which of the following is ortho and para directing group choose which one is correct:

  1. −OH
  2. −OCH3
  3. −CHO
  4. −NH2

24. Among the following compounds which can be readily sulphonated choose which one is correct:

  1. Phenol
  2. Benzene
  3. Nitrobenzene
  4. Chlorobenzene

25. Structure of benzene is resonance hybrid of all ⎯⎯⎯⎯ structures choose which one is correct:

  1. 3
  2. 4
  3. 5
  4. 6

26. Aromatic hydrocarbons are derivatives of choose which one is correct:

  1. Paraffins
  2. Alkene
  3. Benzene
  4. Cyclohexane

27. Which of the following explains the structure of benzene choose which one is correct:

  1. Atomic orbital treatment of benzene
  2. Resonance method
  3. Both A. and (b)
  4. None

28. The conversion of n-hexane into benzene by heating in the presence of (Al2O+ SiO+ Cr2O3) is called choose which one is correct:

  1. Isomerization
  2. Aromatization
  3. Dealkylation
  4. Rearrangement

29. Toluene can be converted to benzoic acid in the presence of choose which one is correct:

  1. dil. NaOH
  2. dil. HNO3
  3. Conc. HNO3
  4. Acidified KMnO4

30. Cyclic structure of benzene was proposed by choose which one is correct:

  1. Dewar
  2. Faraday
  3. Down
  4. Kekule

31. Benzene does not undergo choose which one is correct:

  1. Addition
  2. Substitution
  3. Polymerization
  4. Aromatization

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