MCQ Polynuclear Hydrocarbons Pharmaceutical Organic Chemistry 3rd semester B.Pharmacy

polynuclear hydrocarbon mcq

MULTIPLE CHOICE QUESTION of Polynuclear Hydrocarbons of Pharmaceutical Organic Chemistry 3rd semester B.Pharmacy

1. In aromatic hydrocarbons they have

  • a) Only sigma bonds
  • b) Only pi bonds
  • c) a sigma and delocalized pi bond
  • d) a sigma and two pi bond

Answer- c) a sigma and delocalized pi bond

2. Which among these is the simplest example for polynuclear hydrocarbon?

a) Pyrene

  • b) Dibenzoanthracene
  • c) Naphthalene
  • d) Benzacephenanthyrlene

Answer- c) Naphthalene

3. The main sources of polynuclear hydrocarbons are

  • a) Biogas and petroleum
  • b) Natural gas
  • c) Petroleum
  • d) Coal tar and petroleum

Answer- d) Coal tar and petroleum

4. Phenanthrene is a fused polycyclic compound contains

  • a) Three benzene rings
  • b) Four benzene rings
  • c) Two benzene rings
  • d) Four benzene rings

Answer- a) Three benzene rings

5. As compare to benzene, Naphthalene is

  • a) More reactive and more aromatic
  • b) More reactive and less aromatic
  • c) Less reactive and less aromatic
  • d) Less reactive and more aromatic

 Answer- b) More reactive and less aromatic

6. Naphthalene on reaction with H/Ni gives

  • a) Cis decalin
  • b) Trans decalin
  • c) Cis tetralin
  • d) Trans tetralin

Answer- b) Trans decalin

7. Which is fused cyclic aromatic compound?

  • a) Biphenyl
  • b) Diphenyl methane
  • c) Diphenylamine
  • d) Naphthalene

Answer- d) Naphthalene

8. In Friedel crafts alkylation AICI3 is used to generate

  • a) Strong nucleophile
  • b) Strong electrophile
  • c) Weak nucleophile
  • d) Weak electrophile

Answer- b) Strong electrophile

9. Naphthalene on oxidation with KMnO4 in acidic medium gives

  • a) Phthaldehyde
  • b) Phthalic anhydride
  • c) Phthalic acid
  • d) Phthalonic acid

Answer- c) Phthalic acid

10. Electrophile attack on naphthalene at

  • a) C1
  • b) C3
  • c)  C2
  • d) C4

Answer- a) C1

11. In addition reaction of naphthalene all atoms of bromine and chlorine add on

  • a) Same ring
  • b) Other ring
  • c) Both the ring
  • d) None of above

Answer- a) Same ring

12. In Friedel crafts acylation of naphthalene use of non polar solvent gives

  • a) 1-substituted product
  • b) 2-substituted product
  • c) 3-substituted product
  • d) 4-substituted product

Answer- a) 1-substituted product

13. On sulphonation of naphthalene at 165°C it gives

  • a) 1-Naphthalene sulfonic acid
  • b) 2-Naphthalene sulfonic acid
  • c) 3-Naphthalene sulfonic acid
  • d) 1 and 2-Naphthalene sulfonic acid

Answer- b) 2-Naphthalene sulfonic acid

14 .All carbon atoms in anthracene are

  • a) sp hybridized
  • b) sp² hybridized
  • c) sp³ hybridized
  • d) None of above

Answer- b) sp² hybridized

15. 1-Nitronaphthalene on reduction yields

  • a) 1-Naphthylamine
  • b) 2-Naphthylamine
  • c) 1-Naphthol
  • d) 2-Naphthol

Answer- a) 1-Naphthylamine

16. What happens when two molecules of benzyl chloride condensed in presence of AICl3

  • a) Naphthalene is formed
  • b) Phenanthrene is formed
  • c) Anthracene is formed
  • d) None of above

Answer- c) Anthracene is formed

17. In polar solvent Friedel-Crafts acylation in anthracene occurs at-.

  • a) C9 position
  • b) C2 position
  • c) C4 position
  • d) C1 position

Answer- d) C1 position

18. Anthracene on oxidation with Na2Cr2O7 to give

  • a) Phthalic acid
  • b) Benzoic acid
  • c) Anthraquinone
  • d) Benzophenone

Answer- c) Anthraquinone

19. Anthracene undergoes electrophillic substitution reactions mainly at

  • a) C-1
  • b) C-9
  • c) C-2
  • d) C-4

Answer- b) C-9

20. Sulfonation on anthracene with excess H2SO4 to give-

  • a) 1,2 and 2,7 sulfonic acid
  • b) 1,8 and 2,7 sulfonic acid
  • c) 1,2 and 2,9 sulfonic acid
  • d) 1,8 and 2,9 sulfonic acid

Answer- b) 1,8 and 2,7 sulfonic acid

21. Anthraquinone on reduction with Zn dust in aq. NH,OH yields

  • a) Anthraquinol
  • b) Bianthryl
  • c) Anthrone
  • d) 9,10-dihydroanthrol

Answer- d) 9,10-dihydroanthrol

22. Anthraquinone on heating with oleum at 160°C gives

  • a) 1-sulfonic acid
  • b) 2-sulfonic acid
  • c) 6-sulfonic acid
  • d) 7-sulfonic acid

Answer- b) 2-sulfonic acid

23. Phenanthrene on reduction gives

  • a) Diphenic acid
  • b) 9,10-phenanthraquinone
  • c) 9,10-dihydrophenanthrene
  • d) Diphenyl aldehyde

Answer- c) 9,10-dihydrophenanthrene

24. On ozonolysis of phenanthrene, it gives

  • a) Phenanthraquinone
  • b) Diphenic acid
  • c) Phenanthranic acid
  • d) Diphenylaldehyde

Answer- d) Diphenylaldehyde

25. Phenanthraquinone on oxidation with Na₂Cr₂O, yields

  • a) Diphenic acid
  • b) Phenanthrene
  • c) Diphenyl aldehyde
  • d) None of above

Answer- a) Diphenic acid

26. Oxidation of Diphenyl methane with chronic acid yields

  • a) Acetophenone
  • b) Benzophenone
  • c) Fluorene
  • d) Triphenylmethane

Answer- b) Benzophenone

27. Benzene on reaction with chloroform or carbon tetrachloride in presence of AICI, gives

  • a) Diphenylmethane
  • b) Triphenylmethane
  • c) Both (a) and (b)
  • d) None of above

Answer- b) Triphenylmethane

Leave a Comment