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Class 11 Chemistry MCQ Chapter 13 Hydrocarbons
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Hydrocarbons
Chapter: 13
| MCQ |
1. What are hydrocarbons?
(i) Compounds of carbon and nitrogen only.
(ii) Compounds of carbon and hydrogen only.
(iii) Compounds of hydrogen and oxygen only.
(iv) Compounds of carbon, hydrogen, and oxygen.
Ans: (ii) Compounds of carbon and hydrogen only.
2. What is the source of coal gas?
(i) Fractional distillation of crude oil
(ii) Destructive distillation of coal.
(iii) Liquefaction of natural gas.
(iv) Compression of natural gas.
Ans: (ii)Destructive distillation of coal.
3. Which of the following is the first member of the alkane family?
(i) Ethane.
(ii) Propane.
(iii) Methane.
(iv) Butane.
Ans: (iii) Methane.
4. What is the general formula for alkanes?
(i) CₙH₂ₙ
(ii) CₙH₂ₙ₊₁
(iii) CₙH₂ₙ₋₁
(iv) CₙHₓ
Ans: (ii) CₙH₂ₙ₊₁
5. A dibromo derivative of an alkane reacts with sodium metal to form an alicyclic hydrocarbon. The derivative is ______.
(i) 2, 2-dibromobutane.
(ii) 1, 1-dibromopropane.
(iii) 1, 4-dibromobutane.
(iv) 1, 2-dibromoethane.
Ans: (iv) 1, 2-dibromoethane.
6. Hydrocarbon which is liquid at room temperature is-
(i) Butane.
(ii) Methane.
(iii) ethane.
(iv) pentane.
Ans: (iv) pentane.
7. In the name “3-ethyl-2,2-dimethylpentane,” how many carbon atoms are in the longest chain?
(i) 3
(ii) 4
(iii) 5
(iv) 6
Ans: (iii)5
8. Which of the following correctly represents the final structure of 3-ethyl-2,2-dimethylpentane?
(i) CH₃-CH(CH₃)-C(CH₃)₂-CH₂-CH₃
(ii) CH₃-CH(CH₃)-C(CH₂CH₃)-CH₂-CH₃
(iii) CH₃-CH(CH₃)-C(CH₂)-CH₂-CH₃
(iv) CH₃-CH₂-CH(CH₃)-C(CH₃)-CH₃
Ans: (i)CH₃-CH(CH₃)-C(CH₃)₂-CH₂-CH₃
9. What is the product formed when ethene (CH₂=CH₂) is hydrogenated?
(i) Butane.
(ii) Ethane.
(iii) Propane.
(iv) Propene.
Ans: (ii) Ethane.
10. Ozonolysis of acetylene gives-
(i) None of these.
(ii) CHO-CHO.
(iii) CH3CHO.
(iv) HCHO.
Ans: (iv) HCHO.
11. Arrange the following hydrogen halides in order of their decreasing reactivity with propene :
(i) HCl > HBr > HI
(ii) HBr > HI > HCl
(iii) HI > HBr > HCl
(iv) HCl > HI > HBr
Ans. (iii) HI > HBr > HCl
12. In an electrophilic substitution reaction of nitrobenzene, the presence of nitro group
(i) deactivates the ring by inductive effect.
(ii) activates the ring by inductive effect.
(iii) decreases the charge density at ortho and para position of the ring relative to meta position by resonance.
(iv) Both (i) and (iii).
Ans. (iv) Both (i) and (iii).
13. The position of double bond in alkenes can be located by:
(i) Hydrogenation of oil.
(ii) Ozonolysis.
(iii) Photolysis.
(iv) Hydration.
Ans: (ii) Ozonolysis.
14. What is the role of zinc in the reduction of alkyl halides to alkanes?
(i) Oxidizing agent.
(ii) Reducing agent.
(iii) Catalyst.
(iv) Solvent.
Ans: (ii) Reducing agent.
15. Sodium salts of carboxylic acids on heating with soda lime give alkanes through a process known as:
(i) Decarboxylation.
(ii) Hydrogenation.
(iii) Halogenation.
(iv) Oxidation.
Ans: (i) Decarboxylation.
