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Class 11 Chemistry MCQ Chapter 12 Organic Chemistry – Some basic principles and Techniques
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Organic Chemistry – Some basic principles and Techniques
Chapter: 12
| MCQ |
1. In which year did Berthelot synthesise methane?
(i) 1828
(ii) 1845
(iii) 1856
(iv) 1780
Ans: (iii) 1856
2. What is the molecular formula of urea as mentioned in the passage?
(i) NH₄CNO
(ii) NH₂CONH₂
(iii) CH₄
(iv) C₂H₅OH
Ans: (ii) NH₂CONH₂
3. Which of the following is the correct IUPAC name?
(i) 3-Ethyl-4, 4-dimethylheptane.
(ii) 4,4-Dimethyl-3-ethylheptane.
(iii) 5-Ethyl-4, 4-dimethylheptane.
(iv) 4, 4-Bis(methyl)-3-ethylheptane.
Ans. (iii) 5-Ethyl-4, 4-dimethylheptane.
4. The displacement of electrons in a multiple bond in the presence of attacking reagent is called
(i) Inductive effect.
(ii) Electromeric effect.
(iii) Resonance.
(iv) Hyperconjugation.
Ans: (ii) Electromeric effect.
5. What unique property of carbon allows it to form covalent bonds with other carbon atoms?
(i) Isomerism.
(ii) Electronegativity.
(iii) Catenation.
(iv) Hybridization.
Ans: (iii) Catenation.
6. Which of the following behaves both as a nucleophile and as an electrophile?
(i) CH3C ≡ N
(ii) CH3OH
(iii) CH2 = CHCH3
(iv) CH3NH2
Ans: (i) CH3C ≡ N
7. What is the hybridization of the carbon atom in methane (CH₄)?
(i) sp
(ii) sp²
(iii) sp³
(iv) sp³d
Ans: (iii) sp³
8. Identify the chiral molecule among the following:
(i) Isopropyl alcohol.
(ii) 2-pentanol.
(iii) 1-bromo 3-butene.
(iv) Isobutyl alcohol.
Ans: (ii) 2-pentanol.
9. In the condensed structure of methanol (CH₃OH), which group is attached to the hydroxyl group (-OH)?
(i) CH₄
(ii) CH₃
(iii) C₂H₆
(iv) C₂H₄
Ans: (ii) CH₃
10. What is the relationship between character and bond strength in hybrid orbitals?
(i) More s character leads to weaker bonds.
(ii) More s character leads to stronger bonds.
(iii) More p character leads to stronger bonds.
(iv) s and p characters do not affect bond strength.
Ans: (ii) More s character leads to stronger bonds.
11. Which molecular model is best suited to represent compounds containing C=C bonds?
(i) Ball-and-stick model.
(ii) Framework model.
(iii) Space-filling model.
(iv) Ball-and-spring model.
Ans: (iv)Ball-and-spring model.
12. Which of the ions is the most resonance stabilised?
(i) C2H5O-
(ii) C6H5O-
(iii) (CH3)3CO-
(iv) (CH3)2CHO-
Ans: (ii) C6H5O-
13. 0.0833mol of carbohydrate of empirical formula CH2O contain 1g of hydrogen. The molecular formula of the carbohydrate is
(i) C5H10O5
(ii) C3H4O3
(iii) C12H22O11
(iv) C6H12O6
Ans: (iv) C6H12O6
14. During hearing of a court case, the judge suspected that some changes in the documents had been carried out. He asked the forensic deparat- ment to check the ink used at two different places. According to you which technique can give the best results?
(i) Column chromatography.
(ii) Thin layer chromatography.
(iii) Distillation.
(iv) Solvent extraction.
Ans: (ii) Thin layer chromatography.
15. The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapour in vapour phase. A suitable method for the extraction of these oils from the flowers is:
(i) Distillation.
(ii) Crystallisation.
(iii) Distillation under reduced pressure.
(iv) Steam distillation.
Ans: (iv) Steam distillation.
