In This Post we are providing Chapter-6 Hydrocarbons NCERT MCQ for Class 11 Chemistry which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.
NCERT MCQ ON HYDROCARBONS
Question 1 : 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
Answer: 4, 3 and 2
Question 2: 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
Answer: It has a carbon which is not bonded to hydrogen
Question 3: How many isomers are possible for the C5H12 ?
- a) 3
- b) 5
- c) 2
- d) 4
Answer: 3
Question 4: The number of 4° carbon atoms in 2,2,4,4-tetramethyl pentane is –
- a) 2
- b) 4
- c) 1
- d) 3
Answer: 2
Question 5: Which one of the following cannot be prepared by Wurtz reaction ?
- a) CH4
- b) C2H6
- c) Both
- d) None of these
Answer: CH4
Question 6: Pure methane can be produced by
- a) Soda-lime decarboxylation
- b) Reduction with H2
- c) Kolbe’s electrolytic method
- d) Wurtz reaction
Answer: Soda-lime decarboxylation
Question 7: Sodium salts of carboxylic acids on heating with soda lime give alkanes containing _______ than the carboxylic acid
- a) one carbon less
- b) one carbon more
- c) two carbon less
- d) All of these
Answer: one carbon less
Question 8: Which one of the following has the least boiling point?
- a) 2, 2– dimethylpropane
- b) 2-methylpropane
- c) n-butane
- d) n-pentane
Answer: 2, 2– dimethylpropane
Question 9: 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
Answer: n-Octane
Question 10: 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.
Answer: chlorine free radical
Question 11: Which one of the following gives only one monochloro derivative?
- a) neo-pentane
- b) 2-methylpentane
- c) n-hexane
- d) 2, 3-dimethylpentane
Answer: neo-pentane
Question 12: Photochemical halogenation of alkane is an example of
- a) free radical substitution
- b) nucleophilic substitution
- c) electrophilic addition
- d) electrophilic substitution
Answer: free radical substitution
Question 13: 2-Methylbutane on reacting with bromine in the presence of sunlight gives mainly
- a) 2-bromo-2-methylbutane
- b) 1-bromo-2-methylbutane
- c) 2-bromo-3-methylbutane
- d) 1-bromo-3-methylbutane
Answer: 2-bromo-2-methylbutane
Question 14: Liquid hydrocarbons can be converted to a mixture of gaseous hydrocarbons by
- a) cracking
- b) distillation under reduced pressure
- c) hydrolysis
- d) oxidation
Answer: cracking
Question 15: n-Hexane isomerizes in presence of anhydrous aluminum chloride and hydrogen chloride gas to give
- a) Both
- b) 2-Methyl pentane
- c) 3-Methyl pentane
- d) None of these
Answer: Both
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