NCERT Class 11 Chapter 13 Chemistry Hydrocarbons MCQ

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1. Which of the following fuel cause the least pollution ?

A. LPG

B. CNG

C. Petrol

D. Kerosene

2. LPG mainly contains

A. butane

B. ethane

C. methane

D. ethyne

3. Which of the following gas is find in coal mines and marshy places?

A. Methane

B. Ethane

C. Propane

D. Benzene

4. Two adjacent members of a homologous series have

A. All the above

B. same general method of preparation

C. a different of 14 amu in molecular mass

D. a difference of CH₂ in their structure

5. Methane, ethane and propane are said to form a homologous series because all are

A. differ from each other by a CH₂ group

B. aliphatic compounds

C. saturated compounds

D. hydrocarbons

6. The number of primary, secondary and tertiary carbons in 3, 4-dimethylheptane are respectively

A. 4, 3 and 2

B. 4, 2 and 3

C. 2, 3 and 4

D. 3, 4 and 2

7. Which of the following statements is false for isopentane

A. It has a carbon which is not bonded to hydrogen

B. It has one CH group

C. It has three CH₃ groups

D. It has one CH₂ group

8. How many isomers are possible for the C₅H₁₂ ?

A. 3

B. 5

C. 2

D. 4

9. The number of 4° carbon atoms in 2,2,4,4-tetramethyl pentane is

A. 2

B. 4

C. 1

D. 3

10. Which one of the following cannot be prepared by Wurtzreaction ?

A. CH₄

B. C₂H₆

C. Both

D. None of these

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11. Pure methane can be produced by

A. Soda-lime decarboxylation

B. Reduction with H₂

C. Kolbe’s electrolytic method

D. Wurtz reaction

12. Sodium salts of carboxylic acids on heating with soda lime give alkanes containing _______ than the carboxylic acid

A. one carbonless

B. one carbon more

C. two carbonless

D. All of these

13. Which one of the following has the least boiling point?

A. 2, 2– dimethylpropane

B. 2-methylpropane

C. n-butane

D. n-pentane

14. Which one of the following has highest boiling point?

A. n-Octane

B. Iso-octan

C. 2,2 dimethyl pentane

D. All have equal values

15. In the free radical chlorination of methane, the chain initiating step involves the formation of

A. chlorine free radical

B. hydrogen chloride

C. methyl radical

D. chloromethyl radical.

16. Which one of the following gives only one monochloro derivative?

A. neo-pentane

B. 2-methyl pentane

C. n-hexane

D. 2, 3-dimethylpentane

17. Photochemical halogenation of alkane is an example of

A. free radical substitution

B. nucleophilic substitution

C. electrophilic addition

D. electrophilic substitution

18. 2-Methylbutane on reacting with bromine in the presence of sunlight gives mainly

A. 2-Bromo-2-methyl butane

B. 1-Bromo-2-methyl butane

C. 2-Bromo-3-methyl butane

D. 1-Bromo-3-methyl butane

19. Liquid hydrocarbons can be converted to a mixture of gaseous hydrocarbons by

A. cracking

B. distillation under reduced pressure

C. hydrolysis

D. oxidation

20. n-Hexane isomerises in presence of anhydrous aluminium chloride and hydrogen chloride gas to give

A. Both

B. 2-Methyl pentane

C. 3-Methyl pentane

D. None of these

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21. How many conformations are possible for ethane ?

A. infinite

B. 2

C. 3

D. 1

22. Hydrogen molecules differs from chlorine molecule in the following respect

A. Hydrogen molecule cannot participate in coordination bond formation but chlorine molecule can

B. Hydrogen molecule can form intermolecular hydrogen bonds but chlorine molecule does not

C. Hydrogen molecule is polar while chlorine molecule is non-polar

D. Hydrogen molecule is non-polar but chlorine molecule is polar

23. Hydrogen can behave as a metal

A. at very high pressure

B. at very low pressure

C. at very low temperature

D. at very high temperature

24. The property of hydrogen which distinguishes it from alkali metals is

A. its non-metallic character

B. its reducing character

C. its affinity for non metal

D. its electropositive character

25. Hydrogen accepts an electron to form inert gas configuration. In this it resembles

A. halogen

B. chalcogens

C. alkali metals

D. alkaline earth metals