MCQs For NCERT Class 11 Chemistry Chapter 13 Hydrocarbons

Please refer to the MCQ Questions for Class 11 Chemistry Chapter 13 Hydrocarbons with Answers. The following Hydrocarbons Class 11 Chemistry MCQ Questions have been designed based on the latest syllabus and examination pattern for Class 11. Our experts have designed MCQ Questions for Class 11 Chemistry with Answers for all chapters in your NCERT Class 11 Chemistry book.

Hydrocarbons Class 11 MCQ Questions with Answers

See below Hydrocarbons Class 11 Chemistry MCQ Questions, solve the questions and compare your answers with the solutions provided below. 

Question. Using anhydrous AlCl₃ as catalyst, which one of thefollowing reactions produces ethylbenzene (PhEt)?
(a) H₃C – CH₂OH + C₆H₆
(b) CH₃ – CH= CH₂ + C6H₆
(c) H₂C CH₂ + C6H6
(d) H₃C – CH3 + C₆H₆

Question. Select the true statement about benzene amongst the following
(a) because of unsaturation benzene easily undergoes addition
(b) there are two types of C – C bonds in benzene molecule
(c) there is cyclic delocalisation of p-electrons in benzene
(d) monosubstitution of benzene gives three isomeric products.

Question. Which of the following fuel cause the least pollution ?                                 
(a) Petrol
(b) CNG
(c) Kerosene
(d) LPG

Question. LPG mainly contains :                           
(a) ethyne
(b) butane
(c) methane
(d) ethane

Question. Two adjacent members of a homologous series have                                 
(a) a difference of CH₂ in their structure
(b) a different of 14 amu in molecular mass
(c) same general method of preparation
(d) All the above

Question. Methane, ethane and propane are said to form a homologous series because all are                           
(a) hydrocarbons
(b) saturated compounds
(c) aliphatic compounds
(d) differ from each other by a CH₂ group

Question. Which of the following does not belong to the same homologous series?                               
(a) CH₄
(b) C₂H₆
(c) C₃H₈
(d) C₄H₈

Question. The number of chain isomers possible for the hydrocarbon C₅H₁₂ is                             
(a) 1
(b) 2
(c) 3
(d) 4

Question. The number of primary, secondary and tertiary carbons in 3, 4-dimethylheptane are respectively               
(a) 4, 3 and 2
(b) 2, 3 and 4
(c) 4, 2 and 3
(d) 3, 4 and 2

Question. Natural gas is a mixture of :                         
(a) CH₄ + C₂H₆ + C₃H₈
(b) CO + H₂ + CH₄
(c) CO + H₂
(d) H₂O + CO₂

Question. Which of the following gas is find in coal mines and marshy places?                                   
(a) Methane
(b) Ethane
(c) Benzene
(d) Propane

Question. Which of the following represents the correct general formula of alkanes ?                                 
(a) C_nH_2n
(b) C_nH_{2n+ 2}
(c) C_nH_{2n – 2}
(d) C_nH_n

Question. Which of the following statements is false for isopentane–                               
(a) It has three CH₃ groups
(b) It has one CH₂ group
(c) It has one CH group
(d) It has a carbon which is not bonded to hydrogen

Question. Molecular formula of which of the following alkane can exist in more than one structure ?                         
(a) CH₄
(b) C2H₆
(c) C3H₈
(d) C4H₁₀

Question. Which one of the following cannot be prepared by Wurtz reaction ?                             
(a) CH₄
(b) C₂H₆
(c) C₃H₈
(d) C₄H₁₀

Question. The reaction, CH₃ −Br + 2Na + Br – CH₃ → the product, is called                             
(a) Wurtz reaction
(b) Perkin’s reaction
(c) Aldol condensation
(d) Levit reaction

Question. Pure methane can be produced by                               
(a) Wurtz reaction
(b) Kolbe’s electrolytic method
(c) Soda-lime decarboxylation
(d) Reduction with H₂

Question. Sodium salts of carboxylic acids on heating with soda lime give alkanes containing _______ than the carboxylic acid.                         
(a) one carbon more
(b) one carbon less
(c) two carbon less
(d) Either (a) or (b)

Question. How many isomers are possible for the C₅H₁₂ ?                                   
(a) 2
(b) 3
(c) 4
(d) 5

Question. The number of 4° carbon atoms in 2,2,4,4-tetramethyl pentane is –                                 
(a) 1
(b) 2
(c) 3
(d) 4

Question. Which one of the following has the least boiling point?                             
(a) 2, 2– dimethylpropane
(b) n-butane
(c) 2-methylpropane
(d) n-pentane

Question. Which one of the following has highest boiling point?                             
(a) n-Octane
(b) 2,2 dimethyl pentane
(c) Iso-octan
(d) All have equal values

Question. The reagent(s) for the following conversion, is/are

(a) alcoholic KOH
(b) alcoholic KOH followed by NaNH₂
(c) aqueous KOH followed by NaNH₂
(d) Zn / CH₃OH

Question. Photochemical halogenation of alkane is an example of                    (a) electrophilic substitution
(b) electrophilic addition
(c) nucleophilic substitution
(d) free radical substitution

Question. What would be the product formed when l-bromo-3-chlorocyclobutane reacts with two equivalents of metallic sodium in ether ?

Question. 2-Methylbutane on reacting with bromine in the presence of sunlight gives mainly                                 
(a) 1-bromo-3-methylbutane
(b) 2-bromo-3-methylbutane
(c) 2-bromo-2-methylbutane
(d) 1-bromo-2-methylbutane

Question. Aromatisation of n-hexane gives :                                 
(a) cyclohexane
(b) benzene
(c) cycloheptane
(d) toluene

Question. Liquid hydrocarbons can be converted to a mixture of gaseous hydrocarbons by :                           
(a) oxidation
(b) cracking
(c) distillation under reduced pressure
(d) hydrolysis

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.

Question. Which one of the following gives only one monochloro derivative?                         
(a) n-hexane
(b) 2-methylpentane
(c) 2, 3-dimethylpentane
(d) neo-pentane

Question. Spatial arrangements of atoms which can be converted into one another by rotation around a C–C single bond are called                           
(a) Stereoisomers
(b) Tautomers
(c) Optical isomers
(d) Conformers

Question. General formula of alkenes and alkyl radicals arerespectively:                               
(a) C_nH_2n and C_nH_2n+1
(b) C_nH_2n and C_nH_2n+2
(c) C_nH_2n–1 and C_nH_2n
(d) C_nH_2n+1 and C_nH_2n+2

Question. The restricted rotation about carbon-carbon doublebond in 2- butene is due to                               
(a) overlap of one s- and one sp²-hybridized orbitals
(b) overlap of two sp²-hybridized orbitals
(c) overlap of one p-and one sp²-hybridized orbitals
(d) sideways overlap of two p-orbitals

Question. Wurtz reaction involves the reduction of alkyl halide with
(a) Zn/HCl
(b) HI 
(c) Zn/Cu couple
(d) Na in ether     

Question. What is Z in the following reaction?
CH₃—CH₂—CO^–₂Na⁺ →^{NaOH/ CaO} Z
(a) propane
(b) n-butane
(c) ethane
(d) ethyne     

Question. Decarboxylation formation of of sodium propionate leads to the
(a) methane
(b) ethene
(c) propanone
(d) ethane     

Question. (CH₃ )₃ CMgCI on reaction with D₂O produces
(a) (CH₃ )₃ COD
(b) (CH₃ )₃ CH 
(c) (CH₃ )₃ CD
(d) (CH₃ )₃ CD
(e) (CH₃ )₃ COD       

Question. The products formed in reaction is (are)
C₂H₅Br + 2Na + CH₃Br →^{Dry ether}
(a) ethane
(b) propane
(c) butane
(d) ethane, propane and butane     

Question. A Wittig reaction with an aldehyde gives 
(a) ketone compound
(b) a long chain fatty acid
(c) olefin compound
(d) epoxide     

Question. A mixture of 1-chlorobutane and 2-chlorobutane when treated with alcoholic KOH gives 
(a) I -butene
(b) 2-butene
(c) iso-butylene
(d) mixture of 1-butene + 2-butene   

Question. Thermal decomposition of alkanes in the absence of air is called 
(a) cracking
(b) oxidation
(c) combustion
(d) hydrogenation   

Question. CH₃CH₂CH ₃ →^400-600″C  X + Y, X and Y are 
(a) hydrogen and methane
(b) hydrogen and ethylene
(c) ethylene and methane
(d) None of these     

Question. n-propyl bromide on treating with alcoholic KOH produces 
(a) propane
(b) propene
(c) propyne
(d) propanol       

Question. 2-chloro-3-methylbutane is treated with sodium in ethereal solution, then it will give 
(a) 2,4-din1ethylhexane
(b) 3,5-dimethylhexane
(c) 2,3,4,5-tetramethylhexane
(d) 2,6-dimethyloctane     

Question. The major product formed when a 3, 3-dimethyl butan-2-ol is heated with concentrated sulphuric acid, is
(a) 2, 3-dimethyl-2-butene
(b) 2, 3-dimethyl-1-butene
(c) 3, 3-dimethyl-1-butene
(d) cis and trans isomers of 2, 3-dimethyl-1-butene     

Question. An alkyl halide by formation of its Grignard reagent and heating with water yields propane. What is the original alkyl halide ? 
(a) Methyl iodide
(b) Ethyl iodide
(c) Ethyl bromide
(d) Propyl bromide     

Question. Meso-dibromobutane on debromination gives
(a) trans-2-butene
(b) cis-2-butene
(c) I-butene
(d) 1-butyne     

Question. Bond angle in alkenes is equal to                         
(a) 120°
(b) 109°28′
(c) 180°
(d) 60°

Question. n-Hexane isomerises in presence of anhydrous aluminium chloride and hydrogen chloride gas to give       
(a) 2-Methyl pentane
(b) 3-Methyl pentane
(c) Both (a) and (b)
(d) Neither (a) nor (b)

Question. How many conformations are possible for ethane ?                         
(a) 2
(b) 3
(c) infinite
(d) one

Question. The molecular formula of a compound in which double bond is present between C & C :                             
(a) C_nH2_{n + 2}
(b) C_nH_n
(c) C_nH_2n
(d) C_nH2_n–2

Question. Which of the following represents the correct IUPAC name of the compound CH₂ = CH – CH₂ Cl?               
(a) Allyl chloride
(b) 1- chloro -3- propene
(c) 3- chloro-1- propene
(d) Vinyl chloride

Question. The alkene that exhibits geometrical isomerism is                                 
(a) 2- methyl propene
(b) 2-butene
(c) 2- methyl -2- butene
(d) propene

Question. The total number of isomers for C₄H₈ is                                       
(a) 5
(b) 6
(c) 7
(d) 8

Question. Consider the following statements : A hydrocarbon of molecular formula C₅H₁₀ is a                     
I. monosubstituted alkene
II. disubstituted alkene
III. trisubstituted alkene
Which of the following statement(s) is(are) correct?
(a) I, II and III
(b) I and II
(c) II and III
(d) I and III

Question. Hex-2-ene and 2-methylpent-2-ene exhibit                             
(a) chain isomerism
(b) position isomerism
(c) geometrical isomerism
(d) optical isomerism

Question. Which one of the following exhibits geometrical isomerism?                               
(a) 1, 2-dibromopropene
(b) 2, 3-dimethylbut-2-ene
(c) 2, 3-dibromobut-2-ene
(d) Both (a) and (c)

Question. The compounds CH₃CH == CHCH₃ and CH₃CH₂CH == CH₂                                     
(a) are tautomers
(b) are position isomers
(c) contain same number of sp3 – sp³, sp³ – sp² and sp² – sp² carbon-carbon bonds
(d) exist together in dynamic equilibrium

Question. Ethyl bromide gives ethylene when reacted with –                                   
(a) ethyl alcohol
(b) dilute H₂SO₄
(c) aqueous KOH
(d) alcoholic KOH

Question. By which reaction ethene is obtained from ethyne –                             
(a) oxidation
(b) polymerisation
(c) hydrogenation
(d) dehydrogenation

Question. Paraffins are soluble in                               
(a) Distilled water
(b) Benzene
(c) Methanol
(d) Sea water

Question. When hydrochloric acid gas is treated with propene in presence of benzoyl peroxide, it gives                     
(a) 2-Chloropropane
(b) Allyl chloride
(c) No reaction
(d) n-Propyl chloride.

Question. “The addition of unsymmetrical reagents to unsymmetrical alkenes occurs in such a way that the negative part of the addendum goes to that carbon atom of the double bond which arries lesser number of hydrogen atoms” is called by :                               
(a) Saytzeff rule
(b) Markownikoff’s rule
(c) Kharasch effect
(d) Anti-Saytzeff rule

Question. When one mole of an alkene on ozonolysis produces 2 moles of propanone, the alkene is                     
(a) 3-methyl-1-butene
(b) 2, 3-dimethyl-1-butene
(c) 2, 3-dimethyl-2-pentene
(d) 2, 3-dimethyl-2-butene

Question. Reaction of HBr with propene in the presence of peroxidegives                               
(a) isopropyl bromide
(b) 3-bromo propane
(c) allyl bromide
(d) n-propyl bromide

Question. The major product formed when 2-bromobutane is treated with alcoholic KOH is                                 
(a) 2-Butanol
(b) 1-Butene
(c) 1-Butanol
(d) Trans-2-butene