Please refer to Chapter 13 Hydrocarbons MCQ Class 11 Chemistry with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 11 Chemistry. Students should refer to MCQ Questions for Class 11 Chemistry with Answers to score more marks in Grade 11 Chemistry exams. Students should read the chapter Hydrocarbons and then attempt the following objective questions.

MCQ Questions Class 11 Chemistry Chapter 13 Hydrocarbons

The Hydrocarbons MCQ Class 11 Chemistry provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. Ethylene can be converted into alcohol by treatment with
(a) aq KOH 
(b) dil. H₂SO₄
(c) moist silver oxide
(d) Zn/HCI     

Question. The nwnber of optically active products obtained from the complete ozonolysis of the given compound   

(a) 0
(b) 1
(c) 2
(d) 4       

Question. The test for unsaturation is confinned by the decolourisation of which of the following ? 
(a) Iodine water
(b) CuSO₄ solution
(c) Bromine water
(d) All of the above   

Question. The major product in the reaction of 2-butyne with Li/liq. NH₃ is 

Question. Reaction of one molecule of HBr with one molecule of 1, 3-butadiene at 40°C gives predominantly 
(a) 1-bromo-2-butene under kinetically controlled conditions
(b) 3-bromobutene under thermodynamically controlled conditions
(c) 1-bromo-2-butene under thermodynamically controlled conditions
(d) 3-bromobutene under kinetically controlled conditions     

Question.

(a) meso diol
(b) racemic diol
(c) Both (a) and (b)
(d) None of the above       

Question. Following compound is treated with NBS

Compound formed A is

Question. The Markownikoff’s rule is the best applicable to the reaction between 
(a) C₂H₄ + HCI
(b) C₃H₆ + Br₂
(c) C₃H₆ + HBr
(d) C₃H₈ + Cl₂
(e) C₂H₄ + I₂     

Question. An alkene having molecular formula C₉H₁₈ on ozonolysis ives 2, 2-dimethyl propanal and 2-butanone. The alkene is
(a) 2, 2, 2-trimethyl-3-hexene 
(b) 2, 2, 6-trirnethyl-3-hexane
(c) 2, 3, 4-trimethyl-2-hexene
(d) 2, 2, 4-trirnethyl-3-hexene
(e) 2, 2-dimethyl-l, 3-heptene   

Question. Observe the following reactions and predict the nature of A and B 

Question. Which of these does not follow anti-Markownikoffs ule?
(a) 2-butene
(b) 1-butene
(c) 2-pentene
(d) 2-hexene     

Question. Match the chemical conversion in Column I with the appropriate reagents in Column II and select the correct answer using the codes given below the columns.

Codes
     P Q R S
(a) 2 3 1 4
(b) 3 2 1 4
(c) 2 3 4 1
(d) 3 2 4 1   

Question. Cycloalkane has the general formula
(a) C_nH_2n+2
(b) C_nH_2n-2
(c) C_nH_2n
(d) C_2nH₂
(e) C_2nH_2n   

Question. Which of the following cycloalkane gives open chain compound, when reacts with bromine? 
(a) cyclopropane
(b) cyclopentane
(c) cyclohexane
(d) cyclooctane 

Question. Action of bromine on cyclopentene gives
(a) cyclopentyl bromide
(b) 1, 2-dibromo cyclopentane
(c) cyclopentyl dibromide
(d) No reaction   

Question. Cycloalkanes are isomeric with
(a) alkanes
(b) alkenes
(c) alkynes
(d) arenes     

Question. Which of the following has the maxinmm heat of hydrogenation ? 

Question. A dibromo derivative of an alkane reacts with sodium metal to fonn an cyclic hydrocarbon. The derivative is
(a) 1, 1-dibromopropane 
(b) 2, 2-dibromopropane
(c) 1, 2-dibromoethane
(d) 1, 4-dibromobutane     

Question. The angle strain in cyclobutane is
(a) 24°44′
(d) 9°44′
(c) 19°22′
(b) 29°16′     

Question. Which cycloalkane has the lowest heat of combustion per CH₂ group ?
(a) Cyclopropane
(b) Cyclobutane
(c) Cyclopentane
(d) Cyclohexane     

Question. Angle strain in cyclopropane is 
(a) 24°44′
(b) 9°44′
(c) 44′   
(d) – 5°16′

Question. Propyne and propene can be distinguished by 
(a) cone. H₂SO₄
(b) Br₂ in CCI₄
(c) alk. KMnO₄
(d) AgNO₃ in NH₃       

Question. The reactivity of compound Z with clifferent halogens under appropriate conclitions is given below. 

The observed pattern of electrophilic substitution can be explained by 
(a) the steric effect on the halogen
(b) the steric effect of the tert-butyl group
(c) the electronic effect of the phenolic group
(d) the electronic effect of the tert-buty l group 

Question. For which of the following molecule significantμ μ ≠ 0?

(a) Only r
(b) I and II
(c) Only III
(d) III and IV   

Question. Which reagent would you use to carry out the reaction Ethyl benzene ➔ 2 and 4-chloro I-ethyl benzene?
(a) Cl₂ light and heat
(b) Cl₂ , FeCI₃ 
(c) SOCI₂
(d) C₂H₅ Cl, AlCI₃     

Question. Which pair is usually required for a nucleophilic aromatic substitution reaction? 
(a) An-NO₂ substitution and a strong electrophile.
(b) A ring bearing a strong activating group and a strong acid
(c) An aryl halide with an NO₂ and astrongnucleophile.
(d) An unsubstituted benzene ring and a strong electrophilic     

Question. Which one of the following gives a sooty flame on combustion 
(a) C₂H₄
(b) CH₄
(c) C₂H₆
(d) C₆H₆      

Question. Ethyl benzene cannot be prepared by
(a) Wurtz reaction
(b) Wurtz-Fittig reaction
(c) Friedel-Craft’s reaction
(d) Clemmensen reduction         

Question. By passing excess Cl₂ (g) in boiling toluene, which one of the following compounds is exclusively fonned   

23. Friedel-Craft’s reaction using MeCl and anhydrous AICI₃ will take place most efficiently with
(a) benzene
(b) nitrobenzene     
(c) acetophenone
(d) toluene   

Question. The compounds P , Q and S   

where, separately subjected to nitration using HNO₃ / H₂SO₄ mixture. The major product formed in each case respectively, is

Question. In the reaction,
C₆H₅CH₃ →^Oxidation A →^NaOH  B →^{Soda lime} C
the product C is
(a) C₆H₅OH
(b) C₆H₆
(c) C₆H₅COONa
(d) C₆H₅ONa   

Question. The carbon-carbon bond length in benzene is 
(a) in between C₂H₆ and C₂H₄
(b) same as in C₂H₄
(c) in between C₂H₆ and C₂H₂
(d) in between C₂H₄ and C₂H₂     

Question. The carbon-carbon bond distance in benzene is
(a) longer than a C—C single bond
(b) longer than a C = C double bond
(c) shorter than a C = C double bond
(d) shorter than a C = C triple bond     

Question. An aromatic compoundX with molecular formula C₈H₁₀ produces on nitration one mononitro derivative and three dinitro derivatives.CompoundX would be
(a) ethyl benzene
(b) m-xylene 
(c) o -xylene
(d) p-xylene   

Question. The overlapping of orbitals in benzene is of the type
(a) sp -sp
(b) p -p 
(c) sp² -sp²
(d) sp³ – sp³     

Question. Toluene on treatment with CrO₃ and (CH₃CO)₂O followed by hydrolysis with dil. HCl gives 
(a) benzaldehyde
(b) benzoic acid
(c) phenol
(d) phenylacetaldehyde       

Question. Which of the following compounds is aromatic?   

Question. Which one of the following compounds is prepared in the laboratory from benzene by a substitution reaction?
(a) Glyoxal 
(b) Cyclohexane
(c) Acetophenone
(d) Hexabromocyclohexane     

Question. Presence of a nitro group in a benzene ring
(a) activates the ring towards electrophilic substitution
(b) renders the ring basic
(c) deactivates the ring towards nucleophilic substitution
(d) deactivates the ring towards electrophilic substitution       

Question. The compound formed as a result of oxidation of ethyl benzene by KMnO₄ is 
(a) benzophenone
(b) acetophenone
(c) benzoic acid
(d) benzyl alcohol     

Question. C₇H₈ →^3C12,heat A →^Fe/Br2 B →^Zn/HCI C Here, the compound C is 
(a) 3-bromo -2, 4, 5, 6-trichlorotoluene
(b) o-bromotoluene
(c) p-bromotoluene
(d) m-bromotoluene     

Question. Using anhydrous AICl₃ as catalyst, which one of the following reactions produce ethylbenzene (PhEt) ?
(a) H₃C — CH₂OH + C₆H₆ 
(b) CH₃ — CH = CH₂ + C₆H₆
(c) H₂C = CH₂ + C₆H₆
(d) H₃C — CH₃ + C₆H₆     

Question. Benzene reacts with chlorine in sunlight to give a final product
(a) CCI₄
(b) C₆H₆Cl₆
(c) C₆Cl₆
(d) C₆H₅CI       

Question. A cyclic hydrocarbon molecule has all the carbon and hydrogen in a single plane. All the carbon-carbon bonds are of same length, less than 1.54 A, but more than 1.34 A. The C—C bond angle will be 
(a) 109°28′
(b) 100°
(c) 180°
(d) 120°       

Question. Pick out the wrong statement.
(a) Toluene shows resonance
(b) The hybrid state of carbon in carbonyl group is sp²
(c) The hyperconjugative effect is known as no bond esonance
(d) Dipole moment of vinyl chloride is less than that of methyl chloride 

Question. 4-nitrotoluene     →^{K₂Cr₂O₇} product. The product in the reaction is
                                                ^H₂SO₄
(a) benzoic acid
(b) 4-nitrobenzene
(c) 4-nitrobenzoic acid
(d) 2-nitrobenzoic acid     

Question. Friedel-Craft acylation can be given by X is

Question. Identify the substitute group, that acts as ortho-para director, during electrophilic substitution in aromatic compounds.
(a) —NH₂
(b) —NO₂
(c) —SO₃H
(d) —N₂       

Question. According to Huckel’s rule an aromatic compound must possess 
(a) (4n + 1) n-electrons
(b) (4n + 2) n-electrons
(c) 4n n-electrons
(d) (4n + 3) n-electrons         

Question. Distillation of acetone with concentrated sulphuric acid gives 
(a) diacetone alcohol
(b) mesityl oxide
(c) mesitylene
(d) propene-2-ol     

Question. Phenyl magnesium bromide reacts with methanol to give
(a) a mixture of anisol and Mg(OH)Br 
(b) a mixture of benzene and Mg(OMe)Br
(c) a mixture of toluene and Mg(OH)Br
(d) a mixture of phenol and Mg(Me)Br     

Question. Two organic compounds A and B both containing only carbon and hydrogen, on quantitative analysis gave the same percentage composition by weight
      C=(12/13)x 100%, H=(1/13)x 100%
A decolourises bromine water but B does not. A and B respectively are
(a) C₂H₂ and C₆H₆
(b) C₆H₆ and C₂H₂
(c) C₂H₄ and C₂H₆
(d) C₂H₂ and C₂H₆     

Question. What is obtained when chlorine is passed in boiling toluene and product is hydrolysed ? 
(a) o-cresol
(b) p-cresol
(c) 2, 4-clihydroxytoluene
(d) benzyl alcohol     

Question. Aromatisation of n-heptane by passing over (Al₂O₃ + Cr₂O₃ )catalystat773Kgives
(a) benzene
(b) toluene
(c) mixture of both
(d) heptylene     

Question. C₆H₅CH₃ →^{CrO₂C₁₂} z 
In the given sequence, Z is
(a) benzaldehyde
(c) phenyl acetic acid
(b) toluic acid
(d) benzoic acid       

Question. Benzene can be obtained by heating either benzoic acid with X or phenol with Y. X and Y are respectively 
(a) zinc dust and soda lime
(b) soda lime and zinc dust
(c) zinc dust and sodium hydroxide
(d) soda lime and copper     

Question. Which of the following reacts with benzene in presence of anhydrous aluminium chloride and forms acetophenone ? 
(a) CH₃CI
(b) CH₃COOH
(c) CH₃CHO
(d) CH₃COCI       

Question. The conclitions for aromaticity is 
(a) molecule must have clouds of delocalised n-electrons
(b) molecule must contain (4n + 2) n-electrons
(c) Both (a) and (b)
(d) None of the above   

Question. Match the following Column I and Column II.   

Codes 
      A   B  C  D
(a)  4  3  2  1
(b)  3  2  1  4
(c)  2  4  5  3
(d)  5  1  4 3     

Question. When chlorine is passed through warm benzene in presence of the sunlight, the product obtained iS:
(a) benzotrichloride
(b) chlorobenzene
(c) gammexane
(d) DDT     

Question. Aromatic compound among other things should have a 1t-electron cloud containing ( 4n + 2) π-electrons where, n cannot be
(a) 1/ 2
(b) 3 
(c) 2
(d) 1     

Question. The presence of the chlorine atom on benzene ring makes the second substituent enter at a position 
(a) ortho
(b) meta
(c) para
(d) ortholpara     

Question. Which of the following have delocalised electron ?
(a) Benzene
(b) Cyclohexane
(c) CH₄
(d) C₂H₆     

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