Class 11 Chemistry Chapter 13 Hydrocarbons MCQ Questions with Answer

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Hydrocarbons Class 11 MCQ Questions with Answer

Class 11 Chemistry MCQ with answers are given here to Chapter 13 Hydrocarbons. These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 11 Chemistry syllabus. By Solving these Class 11 MCQs, you will be able to analyze all of the concepts quickly in the chapter and get ready for the Class 11 Annual exam.

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Question 1. The correct statement regarding the comparison of staggered and eclipsed conformations of ethane, is
(a) the eclipsed conformation of ethane is morestable than staggered conformation even though the eclipsed conformation has torsional strain
(b) the staggered conformation of ethane is more stable than eclipsed conformation, because staggered conformation has no torsional strain
(c) the staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has torsional strain
(d) the eclipsed conformation of ethane is more stable than staggered conformation, because eclipsed conformation has no torsional strain.

Question 2. Which of the following alkane cannot be made in good yield by Wurtz reaction?
(a) n-Hexane
(b) 2, 3-Dimethylbutane
(c) n-Heptane
(d) n-Butane

Question 3. Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is
(a) CH CH
(b) CH₂ CH₂
(c) CH₃ — CH₃
(d) CH₄ 

Question 4. With respect to the conformers of ethane, which of the following statements is true?
(a) Bond angle changes but bond length remains ame.
(b) Both bond angle and bond length change.
(c) Both bond angle and bond length remain same.
(d) Bond angle remains same but bond length changes.

Question 5. The most stable conformation of n-butane is
(a) gauche
(b) staggered
(c) skew boat
(d) eclipsed. 

Question 6. Which of the following is used as an antiknocking material?
(a) Glyoxal
(b) Freon
(c) T.E.L.
(d) Ethyl alcohol 

Question 7. The alkane that gives only one monochloro product on chlorination with Cl₂ in presence of diffused sunlight is
(a) 2,2-dimethylbutane
(b) neopentane
(c) n-pentane
(d) isopentane.

Question 8. Liquid hydrocarbons can be converted to a mixtureof gaseous hydrocarbons by
(a) oxidation
(b) cracking
(c) distillation under reduced pressure
(d) hydrolysis.

Question 9. In the commercial gasolines, the type ofhydrocarbons which are more desirable is
(a) linear unsaturated hydrocarbon
(b) toluene
(c) branched hydrocarbon
(d) straight-chain hydrocarbon. 

Question 10. The compound that will react most readily with gaseous bromine has the formula
(a) C₃H₆
(b) C₂H₂
(c) C₄H₁₀
(d) C₂H₄

Question 11. Reactivity of hydrogen atoms attachedto different carbon atoms in alkanes has the order
(a) tertiary > primary > secondary
(b) primary > secondary > tertiary
(c) both (a) and (b)
(d) tertiary > secondary > primary.

Question 12. Dihedral angle in staggered form of ethane is
(a) 0°
(b) 120°
(c) 60°
(d) 180°

Question 13. Which is maximum stable?
(a) 1-Butene
(b) cis-2-Butene
(c) trans-2-Butene
(d) All have same stability. 

Question 14. Wet ether is not used as a solvent in Wurtz reaction, because the water present in it 
(a) hydrolysis RX to ROH
(b) reduces RX to RH
(c) destroy the Na metal
(d) reacts with R—R       

Question 15. Reaction of HBr with propene in the presence of peroxide gives
(a) isopropyl bromide
(b) 3-bromopropane
(c) allyl bromide
(d) n-propyl bromide.

Question 16. Which reagent converts propene to 1-propanol?
(a) H₂O, H₂SO₄
(b) B₂H₆, H₂O₂, OH–
(c) Hg(OAc)₂, NaBH₄/H₂O
(d) Aq. KOH 

Question 17. Methyl bromide is converted into ethane by heating it in ether medium with 
(a) Al
(b) Zn
(c) Na
(d) Cu       

Question 18. By which one of the following compounds both CH₄ and CH₃—CH₃ can be prepared in one step? 
(a) CH₃I
(b) CH₃OH
(c) CH₃CH₂I
(d) C₂H₅OH       

Question 19. The synthesis of 3-octyne is achieved by adding a bromoalkane into a mixture of sodium amide and an alkyne. 
The bromoalkane and alkyne respectively are
(a) BrCH₂CH₂CH₂CH₂CH₃ and CH₃CH₂C=CH
(b) BrCH₂CH₂CH₃ and CH3CH₂CH₂C=CH
(c) BrCH₂CH₂CH₂CH₂CH₃ and CH₃C=CH
(d) BrCH₂CH₂CHH_2H3 and CH₃CH₂C = CH     

Question 20. The chemicals and the reaction conditions required for the preparation of ethane are 
(a) C₂H₅ I, Zn -Cu, C₂H₅OH
(b) CH₃Cl, Na, H₂O
(c) KOOC-CH = CH-COOK electrolysis
(d) CH₃CO₂Na, NaOH, CaO, Δ     

Question 21. Pure methane can be produced by
(a) Wurtz reaction
(b) Kolbe’s electrolytic method
(c) soda lime decarboxylation
(d) reduction with H₂     

Question 22. Alkyl halides react with dialkyl copper reagents to give
(a) alkenyl halides
(b) alkanes 
(c) alkyl copper halides
(d) alkenes     

Question 23. For synthesis of 1-butene, CH₃ Mgl should be treated with
(a) propene
(b) 2-chloropropene
(c) allyI chloride
(d) ethyl chloride     

Question 24. Butene-I may be converted to butane by reaction with
(a) Zn-HCl
(b) Sn-HCl 
(c) Zn-Hg
(d) Pd/H₂     

Question 25. 2-Bromopentane is heated with potassium ethoxide in ethanol. The major product obtained is
(a) trans-2-pentene
(b) 1-pentene
(c) 2-ethoxy pentane
(d) 2-cis-pentene.

Question 26. Geometrical isomers differ in
(a) position of functional group
(b) position of atoms
(c) spatial arrangement of atoms
(d) length of carbon chain. 

Question 27. Product fo1med on electro! ysis of potassium salt of fumaric and maleic acid is 
(a) ethane
(b) ethene
(c) ethyne
(d) methane       

Question 28. 2-Butene shows geometrical isomerism due to
(a) restricted rotation about double bond
(b) free rotation about double bond
(c) free rotation about single bond
(d) chiral carbon. 

Question 29. Reduction of 2-butyne with sodium in liquidammonia gives predominantly
(a) cis-2-butene
(b) no reaction
(c) trans-2-butene
(d) n-butane. 

Question 30. The restricted rotation about carbon carbon double bond in 2-butene is due to
(a) overlap of one s and 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.

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Question 31. Which one of the following can exhibit cis-trans isomerism?
(a) CH₃ – CHCl – COOH
(b) H – C≡ C – Cl
(c) ClCH =CHCl
(d) ClCH₂ – CH₂Cl

Question 32. In preparation of alkene from alcohol using Al₂O₃ which is the effective factor?
(a) Porosity of Al₂O₃
(b) Temperature
(c) Concentration
(d) Surface area of Al₂O₃ 

Question 33. The reaction, CH₂= CH – CH₃ + HBr → CH₃CHBr – CH₃ is
(a) electrophilic substitution
(b) free radical addition
(c) nucleophilic addition
(d) electrophilic addition. 

Question 34. Which of the following has zero dipole moment?
(a) 1-Butene
(b) 2-Methyl-1-propene
(c) cis-2-Butene
(d) trans-2-Butene 

Question 35. One of the following which does not observe the anti-Markownikoff’s addition of HBr, is
(a) pent-2-ene
(b) propene
(c) but-2-ene
(d) but-1-ene. 

Question 36. The pair of electrons in the given carbanion,CH₃C C –, is present in which of the followingorbitals?
(a) sp²
(b) sp
(c) 2p
(d) sp³

Question 37. Which of the following organic compounds hassame hybridization as its combustion product (CO₂)?
(a) Ethane
(b) Ethyne
(c) Ethene
(d) Ethanol

Question 38. A compound is treated with NaNH₂ to give sodium salt. Identify the compound.
(a) C₂H₂
(b) C₆H₆
(c) C₂H₆
(d) C₂H₄ 

Question 39. The shortest C–C bond distance is found in
(a) diamond
(b) ethane
(c) benzene
(d) acetylene. 

Question 40. Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne?
(a) NaNH₂
(b) HCl
(c) O₂
(d) Br₂

Question 41. The cylindrical shape of an alkyne is due to
(a) two sigma C – C and one p C – C bonds
(b) one sigma C – C and two p C – C bonds
(c) three sigma C – C bonds
(d) three p C – C bonds.

Question 42. When acetylene is passed through dil. H₂SO₄ in thepresence of HgSO₄, the compound formed is
(a) acetic acid
(b) ketone
(c) ether
(d) acetaldehyde.

Question 43. Acetylenic hydrogens are acidic because
(a) sigma electron density of C – H bond in acetylene is nearer to carbon, which has 50%s-character 
(b) acetylene has only open hydrogen in eachcarbon 
(c) acetylene contains least number of hydrogens among the possible hydrocarbons having twocarbons 
(d) acetylene belongs to the class of alkynes with molecular formula, CnH₂n^–2.

Question 44. Considering the state of hybridization of carbon atoms, find out the molecule among the following which is linear?
(a) CH₃ — CH= CH — CH₃
(b) CH₃ — C≡ C — CH₃
(c) CH₂ CH — CH₂ — C≡ CH
(d) CH₃ — CH2 — CH₂ — CH₃

Question 45. The oxidation of benzene by V₂O₅ in the presence of air produces
(a) maleic anhydride
(b) benzoic acid
(c) benzaldehyde
(d) benzoic anhydride.

Question 46. Some meta-directing substituents in aromaticsubstitution are given. Which one is most deactivating?
(a) — COOH
(b) — NO₂
(c) — C≡ N
(d) — SO₃H

Question 47. Which is the most suitable reagent among the following to distinguish compound (3) from rest of the compounds?
(1) CH₃ – C C – CH₃
(2) CH₃ – CH₂ – CH2 – CH₃
(3) CH₃ – CH2C≡ CH
(4) CH₃ – CH= CH₂
(a) Bromine in carbon tetrachloride
(b) Bromine in acetic acid
(c) Alk. KMnO₄
(d) Ammoniacal silver nitrate

Question 48. Benzene reacts with CH₃Cl in the presence of anhydrous AlCl₃ to form
(a) chlorobenzene
(b) benzyl chloride
(c) xylene
(d) toluene. 

Question 49. Which of the following can be used as the halide component for Friedel–Crafts reaction?
(a) Chlorobenzene
(b) Bromobenzene
(c) Chloroethene
(d) Isopropyl chloride

Question 50. Which of the following compounds will not undergo Friedel-Crafts reaction easily?
(a) Nitrobenzene
(b) Toluene
(c) Cumene
(d) Xylene

Question 51. Among the following compounds the one that is most reactive towards electrophilic nitration is
(a) benzoic acid
(b) nitrobenzene
(c) toluene
(d) benzene.

Question 52. The correct order of reactivity towards theelectrophilic substitution of the compounds aniline (I), benzene (II) and nitrobenzene (III) is
(a) III > II > I
(b) II > III > I
(c) I < II > III
(d) I > II > III

Question 53. Electrophile in the case of chlorination of benzene in the presence of FeCl₃ is
(a) Cl
(b) FeCl₃
(c) Cl⁺
(d) Cl^–

Question 54. Consider the nitration of benzene using mixed conc. H₂SO₄ and HNO₃. If a large amount of KHSO₄is added to the mixture, the rate of nitration will be
(a) unchanged
(b) doubled
(c) faster
(d) slower.

Question 55. Nitrobenzene can be prepared from benzene byusing a mixture of conc. HNO₃ and conc. H₂SO₄. In the mixture, nitric acid acts as a/an
(a) acid
(b) base
(c) catalyst
(d) reducing agent.

Question 56. In Friedel-Crafts alkylation, besides AlCl₃ the other reactants are
(a) C₆H₆ + CH₃Cl
(b) C₆H₆ + CH₄
(c) C₆H₆ + NH₃
(d) C₆H₆ + CH₃COCl

Question 57. Which one of these is not compatible with arenes?
(a) Electrophilic additions
(b) Delocalisation of p-electrons
(c) Greater stability
(d) Resonance

Question 58. The order of decreasing reactivity towards an electrophilic reagent, for the following would be
(i) benzene (ii) toluene
(iii) chlorobenzene (iv) phenol
(a) (ii) > (iv) > (i) > (iii)
(b) (iv) > (iii) > (ii) > (i)
(c) (iv) > (ii) > (i) > (iii)
(d) (i) > (ii) > (iii) > (iv)

Question 59. The reactive species in the nitration of benzene is
(a) NO₃
(b) HNO₃
(c) NO₂ ⁺
(d) NO₂^–

Question 60. In Friedel-Crafts reaction, toluene can be prepared by
(a) C₆H₆ + CH₃Cl
(b) C₆H₅Cl + CH₄
(c) C₆H₆ + CH₂Cl₂
(d) C₆H₆ + CH₃COCl 

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