Class 12 Chemistry MCQs

Full book Important class 12 chemistry mcqs with Answers written by Honorable Professor Mr. Adnan Haider Sahib. These notes are very helpful in the preparation of mcqs of class 12 chemistry mcqs for the students of the intermediate and these are according to the paper patterns of all Punjab boards.

Summary and Contents:
Topics which are discussed in the notes are given below:
  • Important chemistry 12 mcqs for Intermediate part-II students.
  • 1. The addition of unsymmetrical reagent to an unsymmetrical alkene is in accordance with the rule:  (a) Hund’s rule  (b) Markownikov’s rule  (c) Pauli’s Exclusionj Principle  (d) High boiling gas
  • Important mcqs for chemistry class 12 for Intermediate part-II students.
  • 2. Which acetylene reach with HCk to form:  (a) Polyacetylene  (b) Benzene  (c) Chloroprene  (d) Divinylacetylene
  • 3. Which compound is the most reactive?  (a) Benzene  (b) Ethene  (c) Ethane  (d) Ethyne
  • Important 12 chemistry mcqs with answers pdf for Intermediate part-II students.
  • 4. Synthetic rubber is made by polymerization of:  (a) Vinylacetate  (b) Acetylene  (c) Divinylacetylene  (d) Chloroprene
  • 5. Which gas is used for artificial ripening of fruits?  (a)  Ethene  (b) Methane  (c) Propane  (d) Ethyne
  • Important 12th chemistry mcqs with answers pdf for Intermediate part-II students.
  • 6. Aromatic hydrocarbons are the derivatives of:  (a) Normal series of paraffins  (b) Alkene  (c) Benzene  (d) Cylcohexane
  • 7. Aromatic compounds burn with sooty flame because:  (a) They have high percentage of hydrogen  (b) They have a ring structure  (c) They have high percentage of carbon  (d) They resist reaction with air
  • Important chemistry mcqs for class 12 with answers pdf for Intermediate part-II students.
  • 8. The benzene molecule contains:  (a) three double bonds  (b)  two double bonds  (c) one double bond  (d)  delocalized π-electron cloud
  • 9. The carbon-carbon (C-C) bond length in benzene is:  (a) 1.34 A°  (b) 1.20 A°  (c) 1.39 A°  (d) 1.54 A°
  • Important chemistry mcqs for class 12 chapter wise pdf for Intermediate part-II students.
  • 10. The conversion of n-hexane into benzene by heating in the presence of Pt is called:  (a) Isomerization  (b)  Aromatization  (c) Dealkylation  (d) Rearrangement
  • 11. During Nitration of Benzene, the active nitrating agent is:  (a) NO3  (b) NO+2  (c) NO2  (d) HNO3
  • Important chemistry mcqs for class 11 and 12 with answers pdf for Intermediate part-II students.
  • 12. Benzene cannot undergo:  (a)  AlCl3  (b) BeCl2  (c) NaCl  (d) HNO3
  • 13. The reactivity order of alkyl halides for a particular group is:  (a) Flouride > Chloride > Bromide > Iodide  (b) Chloride > Bromide > Flouride > Iodide  (c) Iodide > Bromide > Chlrodie > Flouride  (d) Bromide > Iodide > Chloride > Flouride 
  • Important chemistry mcqs for class 12 chapter wise with answers for Intermediate part-II students.
  • 14. SN2 reactions can be carried out with:  (a)  Primary Reactions alkylhalide  (b) Secondary alkylhalide  (c) Tertiary alkylhalide  (d) All of these
  • 15. Elimination Bimolecular reactions involve:  (a)  Second Order Kinetics  (b) First order Kinetics  (c) Third Order Kinetics  (d) Zero-order-Kinetics
  • Important aldehyde and ketone mcqs for Intermediate part-II students.
  • 16. When CO2 is made to react with ethyl magnesium iodide, followed by acid hydrolysis, the product formed is:  (a) Propane  (b)  Propanoic acid  (c) Propanal  (d) Propanol
  • Important chemistry mcqs for class 12 chapter wise with answers pdf for Intermediate part-II students.
  • 17. The reactivity of Grignard’s reagent is due to:  (a) Polarity of Mg-x bond  (b)  Polarity of C-Mg bond  (c) Electro negativity of halogen atom  (d)  Presence of Mg-atom
  • 18. Grignard’s reagent is reactive due to:  (a) The presence of Halogen atom  (b) The presence of Mg atom  (c) The polarity of C-Mg bond  (d) None of the above
  • Important mcqs on organic chemistry class 12 for Intermediate part-II students.
  • 19. When ethyl magnesium bromide is reacted with HCHO, followed by acid hydrolysis, the product formed is:  (a) Ethanol  (b) I-Propanol  (c) 2-Propanol  (d) Ethanoic acid
  • Important aldehydes ketones and carboxylic acids mcqs with answers  for Intermediate part-II students.
  • 20. In t-butyl alcohol, the tertiary carbon is bonded to:  (a) Three hydrogen atoms  (b) Two hydrogen atoms  (c) One hydrogen atom  (d) No hydrogen atom
  • Important mcqs of organic chemistry class 12 for Intermediate part-II students.
  • 21. Methyl alcohol is not used as:  (a) As a solvent  (b) As an anti freezing agent  (c)  As a substitute for petrol  (d) For denaturing of ethyl alcohol
  • 22. Rectified spirit contains alcohol about:  (a) 80%  (b) 85%  (c) 90%  (d) 95%
  • Important mcqs of surface chemistry class 12 for Intermediate part-II students.
  • 23. The carbon atom of carbonyl group is hybridized:  (a) sp  (b) sp2  (c) sp3  (d) dsp
  • 24. Ketones are prepared by the oxidation of:  (a) Primary alcohol  (b) Secondary alcohol  (c) Tertiary alcohol  (d) None of these
  • Important mcqs on aldehydes and ketones for Intermediate part-II students.
  • 25. Formalin is:  (a) 10% solution of formaldehyde in water  (b) 20% solution of formaldehyde in water  (c) 40% solution of formaldehyde in water  (d) 60% solution of formaldehyde in water

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