NCERT Solutions for class 11 Chemistry | Chapter 13 : Hydrocarbons

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Questions
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:

Hydrocarbon

A (a)
B (b)
C (c)
D (d)

Answer:(d)
17 Find the correct order of increasing acidity

Hydrocarbon

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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