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NCERT Solutions for class 11 Chemistry | Chapter 13 : Hydrocarbons

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Free download in PDF Class 11 Chemistry Chapter 13 Hydrocarbons Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 11 Chemistry with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries./p>

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(1) Assertion (A) : Toluene on Friedal Crafts methylation gives o– and p–xylene.

Reason (R) : CH3-group bonded to benzene ring increases electron density at o– and p– position.

[A] Both A and R are correct and R is the correct explanation of A.
[B] Both A and R are correct but R is not the correct explanation of A.
[C] Both A and R are not correct.
[D] A is not correct but R is correct.
Answer: Both A and R are correct and R is the correct explanation of A.
(2) Assertion (A) : Nitration of benzene with nitric acid requires the use of concentrated sulphuric acid.

Reason (R) : The mixture of concentrated sulphuric acid and concentrated nitric acid produces the electrophile, NO2+ .

[A] Both A and R are correct and R is the correct explanation of A.
[B] Both A and R are correct but R is not the correct explanation of A.
[C] Both A and R are not correct.
[D] A is not correct but R is correct.
Answer: Both A and R are correct and R is the correct explanation of A.

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(3) Assertion (A) : Among isomeric pentanes, 2, 2-dimethylpentane has highest boiling point.

Reason (R) : Branching does not affect the boiling point.

[A] Both A and R are correct and R is the correct explanation of A.
[B] Both A and R are correct but R is not the correct explanation of A.
[C] Both A and R are not correct.
[D] A is not correct but R is correct.
Answer: Both A and R are not correct.
(4) Arrange the following hydrogen halides in order of their decreasing reactivity with propane.
[A] HCl > HBr > HI
[B] HBr > HI > HCl
[C] HI > HBr > HCl
[D] HCl > HI > HBr
Answer: HI > HBr > HCl
(5) The increasing order of reduction of alkyl halides with zinc and dilute HCl is
[A] R–Cl < R–I < R–Br
[B] R–Cl < R–Br < R–I
[C] R–I < R–Br < R–Cl
[D] R–Br < R–I < R–Cl
Answer: R–Cl < R–Br < R–I
(6) Arrange the halogens F2 , Cl2 , Br2 , I2 , in order of their increasing reactivity with alkanes.
[A] I2 < Br2 < Cl2 < F2
[B] Br2 < Cl2 < F2 < I2
[C] F2 < Cl2 < Br2 < I2
[D] Br2 < I2< Cl2 < F2
Answer: I2 < Br2 < Cl2 < F2
(7) Arrange the following in decreasing order of their boiling points.

(A) n–butane (B) 2–methylbutane

(C) n-pentane (D) 2,2–dimethylpropane

[A] A > B > C > D
[B] B > C > D > A
[C] D > C > B > A
[D] C > B > D > A
Answer: C > B > D > A
(8) A compound having a bond angle 180° is
[A] alkyne
[B] alkane
[C] alkene
[D] cycloalkane
Answer: alkyne
(9) C6H5CHO is formed when C6H6 is treated with CO and HCl in the presence of anhydrous AlCl3. Name of the reaction is:
[A] Friedel crafts reaction
[B] Gattermann Koch reaction
[C] Rosenmund reaction
[D] Stephen reaction
Answer: Gattermann Koch reaction
(10) Isopropyl iodide is formed after reaction of propene with HI, this is due to
[A] more stable free radical
[B] homolysis
[C] more stable carbanion
[D] more stable carbocation
Answer: more stable carbocation
(11) Which among the following reagent can be used to distinguish between CH2BrCH=CH2 from CH3CH=CHBr?
[A] Br2/CCl4
[B] cold KMnO4
[C] AgNO3/C2H5OH
[D] Ag(NH3)2OH
Answer: AgNO3/C2H5OH
(12) Which one of the following compound forms salt on reaction with NaNH2?
[A] C2H2
[B] C2H6
[C] C6H6
[D] C2H4
Answer: C2H2
(13) Which one of the following halide can be used in the Friedel-Crafts reaction?
[A] Isopropyl chloride
[B] Bromobenzene
[C] Chlorobenzene
[D] Chloroethene
Answer: Isopropyl chloride
(14) Choose the process by which liquid hydrocarbons can be converted to gaseous hydrocarbons
[A] hydrolysis
[B] oxidation
[C] cracking
[D] distillation under reduced pressure
Answer: cracking
(15) The product obtained on heating 2-Bromopentane with potassium ethoxide in ethanol is
[A] 1-pentene
[B] 2-cis-pentene
[C] trans-2-pentene
[D] 2-ethoxy pentane
Answer: trans-2-pentene
(16) Identify Z in the given reaction:

[A] (a)
[B] (b)
[C] (c)
[D] (d)
Answer: (d)
(17) Find the correct order of increasing acidity

[A] (a)
[B] (b)
[C] (c)
[D] (d)
Answer: (d)
(18) Among the following compounds the one that is most reactive towards electrophilic nitration is
[A] Toluene
[B] Benzene
[C] Benzoic Acid
[D] Nitrobenzene
Answer: Toluene
(19) Which branched chain isomer of the hydrocarbon with molecular mass 72u gives only one isomer of mono substituted alkyl halide?
[A] Tertiary butyl chloride
[B] Neopentane
[C] Isohexane
[D] Neohexane
Answer: Neopentane
(20) Ethyl benzene CANNOT be prepared by ______.
[A] Clemmensen reduction
[B] Wurtz reaction
[C] Wurtz-Fittig reaction
[D] Friedel-Crafts reaction
Answer: Wurtz reaction

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