Practice CBSE Class 11 Chemistry Hydrocarbons MCQs Set A provided below. The MCQ Questions for Class 11 Chapter 9 Hydrocarbons Chemistry with answers and follow the latest CBSE/ NCERT and KVS patterns. Refer to more Chapter-wise MCQs for CBSE Class 11 Chemistry and also download more latest study material for all subjects
MCQ for Class 11 Chemistry Chapter 9 Hydrocarbons
Class 11 Chemistry students should review the 50 questions and answers to strengthen understanding of core concepts in Chapter 9 Hydrocarbons
Chapter 9 Hydrocarbons MCQ Questions Class 11 Chemistry with Answers
Question. A dibromo derivative of an alkane reacts with sodium metal to form an alicyclic hydrocarbon. The derivative is ______.
(a) 2, 2-dibromobutane
(b) 1, 1-dibromopropane
(c) 1, 4-dibromobutane
(d) 1, 2-dibromoethane
Answer: c
Question. Among the following compounds the one that is most reactive towards electrophilic nitration is
(a) Toluene
(b) Benzene
(c) Benzoic Acid
(d) Nitrobenzene
Answer: a
Question. A gas decolourised by KMno4 solution but gives no precipitate with ammoniacal cuprous chloride is
(a) Ethene
(b) Propane
(c) Propene
(d) Methane
Answer: a
Question. A gas decolourised by KMnO4 solution but gives no precipitate with ammoniacal cuprous chloride is
(a) Ethane
(b) Methane
(c) Ethene
(d) Acetylene
Answer: c
Question. When cyclohexane is poured on water, it floats because
(a) Cyclohexane is in boat form
(b) Cyclohexane is in chair form
(c) Cyclohexane is in crown fromorm
(d) Cyclohexane is less dense than water.
Answer: d
Question. Among the three conformations of ethane, the order of stability follows the sequence :
(a) eclipsed > gauche > staggered
(b) eclipsed > staggered > gauche
(c) staggered > gauche > eclipsed
(d) gauche > staggered > eclipsed
Answer: c
Question. A dibromo derivative of an alkane reacts with sodium metal to form an alicyclic hydrocarbon. The derivative is _______
(a) 1, 4-dibromobutane
(b) 1, 2-dibromoethane
(c) carbon
(d) none of the above
Answer: a
Question. Which branched chain isomer of the hydrocarbon with molecular mass 72u gives only one isomer of mono substituted alkyl halide?
(a) Neopentane
(b) Carbon
(c) Isohexane
(d) Neohexane
Answer: a
Question. Meta-directing and deactivating group in aromatic electrophilic substitution is
(a) – CH3
(b) – OH
(c) – NO2
(d) – Cl
Answer: c
Question. During ozonolysis of CH2 == CH2 if hydrolysis is made in absence of Zn dust the products formed are
(a) HCHO
(b) HCOOH
(c) CH2OHCH2OH
(d) CH3OH
Answer: b
Question. Hydrocarbon containing following bond is most reactive
(a) C ≡ C
(b) C = C
(c) C – C
(d) All of these
Answer: c
Question. Which of the following compounds reacts with sodium to liberate hydrogen gas?
(a) Ethane
(b) Propene
(c) Acetylene
(d) Benzene
Answer: c
Question. Benzene easily shows
(a) ring fission reactions since it is unstable
(b) addition reactions since it is unsaturated
(c) electrophilic substitution reactions due to stable ring and high p electron density
(d) nucleophilic substitution reactions due to stable ring and minimum electron density.
Answer: c
Question. Which among the following is very strong o-, p-directing group ?
(a) Cl
(b) OR
(c) NH2
(d) NHR
Answer: d
Question. Which of the following compounds will not undergo Friedal-Crafts reaction easily?
(a) Nitrobenzene
(b) Toluene
(c) Cumene
(d) Xylene
Answer: a
Question. The reaction, RC ≡ CR →H2Lindlar’s catalyst gives the main product as
(a) cis-alkene
(b) trans-alkene
(c) alkane
(d) none of these.
Answer: a
Question. Which of the following species is most stable?
(a) p-O2N — C6H4 — C+H2
(b) C6H5 — C+H2
(c) p-Cl — C6H4 — C+H2
(d) p-CH3O — C6H4 — C+H2
Answer: d
Question. The function of anhydrous AlCl3 in Friedel–Crafts reaction is
(a) to absorb water
(b) to absorb HCl
(c) to produce attacking electrophile
(d) to produce nucleophile.
Answer: c
Question. Which one of these is NOT TRUE for benzene?
(a) Heat of hydrogenation of benzene is less than the theoretical value
(b) There are three carbon-carbon single bonds and three carbon-carbon double bonds
(c) It forms only one type of monosubstituted product
(d) The bond angle between carbon-carbon bonds is 120o
Answer: b
Question. The correct order of reactivity towards electrophilic substitution is
(a) phenol > benzene > chlorobenzene > benzoic acid
(b) benzoic acid > chlorobenzene > benzene > phenol
(c) phenol > chlorobenzene > benzene > benzoic acid
(d) benzoic acid > phenol > benzene > chlorobenzene
Answer: a
Question. HBr reacts with CH2 = CH – OCH3 under anhydrous conditions at room temperature to give
(a) CH3CHO and CH3Br
(b) BrCH2CHO and CH3OH
(c) BrCH2 – CH2 – OCH3
(d) H3C – CHBr – OCH3
Answer: d
Question. Which of the following is Baeyer’s reagent?
(a) alkaline KMnO4
(b) acidic K2Cr2O7
(c) alkaline Na2Cr2O7
(d) MnO2
Answer: a
Question: Which of the following fuel cause the least pollution ?
a) LPG
b) CNG
c) Petrol
d) Kerosene
Answer: LPG
Question: LPG mainly contains
a) butane
b) ethane
c) methane
d) ethyne
Answer: butane
Question: Which of the following gas is find in coal mines and marshy places?
a) Methane
b) Ethane
c) Propane
d) Benzene
Answer: Methane
Question: 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
Answer: All the above
Question: 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
Answer: differ from each other by a CH2 group
Question: 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: 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: How many isomers are possible for the C5H12 ?
a) 3
b) 5
c) 2
d) 4
Answer: 3
Question: 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: Which one of the following cannot be prepared by Wurtz reaction ?
a) CH4
b) C2H6
c) Both
d) None of these
Answer: CH4
Question: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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
Answer: Both
Question: How many conformations are possible for ethane ?
a) infinite
b) 2
c) 3
d) one
Answer: infinite
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Important Practice Resources for Class 11 Chemistry
MCQs for Chapter 9 Hydrocarbons Chemistry Class 11
Students can use these MCQs for Chapter 9 Hydrocarbons to quickly test their knowledge of the chapter. These multiple-choice questions have been designed as per the latest syllabus for Class 11 Chemistry released by CBSE. Our expert teachers suggest that you should practice daily and solving these objective questions of Chapter 9 Hydrocarbons to understand the important concepts and better marks in your school tests.
Chapter 9 Hydrocarbons NCERT Based Objective Questions
Our expert teachers have designed these Chemistry MCQs based on the official NCERT book for Class 11. We have identified all questions from the most important topics that are always asked in exams. After solving these, please compare your choices with our provided answers. For better understanding of Chapter 9 Hydrocarbons, you should also refer to our NCERT solutions for Class 11 Chemistry created by our team.
Online Practice and Revision for Chapter 9 Hydrocarbons Chemistry
To prepare for your exams you should also take the Class 11 Chemistry MCQ Test for this chapter on our website. This will help you improve your speed and accuracy and its also free for you. Regular revision of these Chemistry topics will make you an expert in all important chapters of your course.
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