Hydrocarbons Class 11 MCQ is one of the best strategies to prepare for the CBSE Class 11 Board exam. If you want to complete a grasp concept or work on one’s score, there is no method except constant practice. Students can improve their speed and accuracy by doing more MCQs on Hydrocarbons Class 11, which will help them all through their board tests.
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.
Learn Class 11 Hydrocarbons MCQs with answers pdf free download according to the latest CBSE and NCERT syllabus. Students should prepare for the examination by solving CBSE Class 11 Chemistry Hydrocarbons MCQ with answers given below
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?
(b) 2, 3-Dimethylbutane
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
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
(c) skew boat
Question 6. Which of the following is used as an antiknocking material?
(d) Ethyl alcohol
Question 7. The alkane that gives only one monochloro product on chlorination with Cl2 in presence of diffused sunlight is
Question 8. Liquid hydrocarbons can be converted to a mixtureof gaseous hydrocarbons by
(c) distillation under reduced pressure
Question 9. In the commercial gasolines, the type ofhydrocarbons which are more desirable is
(a) linear unsaturated hydrocarbon
(c) branched hydrocarbon
(d) straight-chain hydrocarbon.
Question 10. The compound that will react most readily with gaseous bromine has the formula
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
Question 13. Which is maximum stable?
(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
(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
Question 18. By which one of the following compounds both CH4 and CH3—CH3 can be prepared in one step?
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) BrCH2CH2CHH2H3 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
(c) alkyl copper halides
Question 23. For synthesis of 1-butene, CH3 Mgl should be treated with
(c) allyI chloride
(d) ethyl chloride
Question 24. Butene-I may be converted to butane by reaction with
Question 25. 2-Bromopentane is heated with potassium ethoxide in ethanol. The major product obtained is
(c) 2-ethoxy pentane
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
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
(b) no reaction
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.
Whoever needs to take the CBSE Class 11 Board Exam should look at this MCQ. To the Students who will show up in CBSE Class 11 Chemistry Board Exams, It is suggested to practice more and more questions. Aside from the sample paper you more likely had solved. These Hydrocarbons Class 11 MCQ are ready by the subject specialists themselves.
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
(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?
Question 35. One of the following which does not observe the anti-Markownikoff’s addition of HBr, is
Question 36. The pair of electrons in the given carbanion,CH3C C –, is present in which of the followingorbitals?
Question 37. Which of the following organic compounds hassame hybridization as its combustion product (CO2)?
Question 38. A compound is treated with NaNH2 to give sodium salt. Identify the compound.
Question 39. The shortest C–C bond distance is found in
Question 40. Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne?
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
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
(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
(b) benzyl chloride
Question 49. Which of the following can be used as the halide component for Friedel–Crafts reaction?
(d) Isopropyl chloride
Question 50. Which of the following compounds will not undergo Friedel-Crafts reaction easily?
Question 51. Among the following compounds the one that is most reactive towards electrophilic nitration is
(a) benzoic acid
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
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
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
(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
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
(c) 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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Frequently Asked Question (FAQs)
How many MCQ questions are there in Class 11 chapter 13 Chemistry?
In Class 11 Chapter 13 Chemistry, we have provided 60 Important MCQ Questions, But in the future, we will add more MCQs so that you can get good marks in the Class 11 exam.
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