NCERT Solutions for class 11 Chemistry | Chapter 13 Hydrocarbons

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Questions
1 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
2 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
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3 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
4 The correct IUPAC name of the following alkane is

Hydrocarbons

A 3,6 – Diethyl – 2 – methyloctane
B 5 – Isopropyl – 3 – ethyloctane
C 3 – Ethyl – 5 – isopropyloctane
D 3 – Isopropyl – 6 – ethyloctane

Answer:3,6 – Diethyl – 2 – methyloctane
5 The addition of HBr to 1-butene gives a mixture of products A, B and C

Hydrocarbons

The mixture consists of

A A and B as major and C as minor products
B B as major, A and C as minor products
C B as minor, A and C as major products
D A and B as minor and C as major products

Answer:A and B as major and C as minor products
6 Which of the following will not show geometrical isomerism?

Hydrocarbons

A (i)
B (ii)
C (iii)
D (iv)

Answer:(iv)
7 Arrange the following hydrogen halides in order of their decreasing reactivity with propene.
A HCl > HBr > HI
B HBr > HI > HCl
C HI > HBr > HCl
D HCl > HI > HBr

Answer:HI > HBr > HCl
8 Arrange the following carbanions in order of their decreasing stability.

Hydrocarbons

A A > B > C
B B > A > C
C C > B > A
D C > A > B

Answer:B > A > C
9 Arrange the following alkyl halides in decreasing order of the rate of β– elimination reaction with alcoholic KOH.

Hydrocarbon

A A > B > C
B C > B > A
C B > C > A
D A > C > B

Answer:A > C > B
10 Which of the following reactions of methane is incomplete combustion:

Hydrocarbon

A (i)
B (ii)
C (iii)
D (iv)

Answer:(iii)
11 Some oxidation reactions of methane are given below. Which of them is/are controlled oxidation reactions?

Hydrocarbon

Hydrocarbon

A (i)
B (ii)
C (iii)
D (iv)

Answer:C, D
12 Which of the following alkenes on ozonolysis give a mixture of ketones only?

Hydrocarbons

A (i)
B (ii)
C (iii)
D (iv)

Answer:C, D
13 Which are the correct IUPAC names of the following compound?

Hydrocarbons

A 5– Butyl – 4– isopropyldecane
B 5– Ethyl – 4– propyldecane
C 5– sec-Butyl – 4– iso-propyldecane
D 4–(1-methylethyl)– 5 – (1-methylpropyl)-decane

Answer:C, D
14 Which are the correct IUPAC names of the following compound?

Hydrocarbons

A 5 – (2′, 2′–Dimethylpropyl)-decane
B 4 – Butyl – 2,2– dimethylnonane
C 2,2– Dimethyl – 4– pentyloctane
D 5 – neo-Pentyldecane

Answer:A, D
15 For an electrophilic substitution reaction, the presence of a halogen atom in the benzene ring _______.
A deactivates the ring by inductive effect
B deactivates the ring by resonance
C increases the charge density at ortho and para position relative to meta position by resonance
D directs the incoming electrophile to meta position by increasing the charge density relative to ortho and para position.

Answer:A, C
16 In an electrophilic substitution reaction of nitrobenzene, the presence of nitro group ________.
A deactivates the ring by inductive effect.
B activates the ring by inductive effect.
C decreases the charge density at ortho and para position of the ring relative to meta position by resonance.
D increases the charge density at meta position relative to the ortho and para positions of the ring by resonance.

Answer:A, C
17 Which of the following are correct?

Hydrocarbons

A (i)
B (ii)
C (iii)
D (iv)

Answer:A, C
18 Four structures are given in options (i) to (iv). Examine them and select the aromatic structures.

Hydrocarbons

A (i)
B (ii)
C (iii)
D (iv)

Answer:A, C
19 The molecules having dipole moment are __________.
A 2,2-Dimethylpropane
B trans-Pent-2-ene
C cis-Hex-3-ene
D 2, 2, 3, 3 - Tetramethylbutane.

Answer:B, C
20 Assertion (A) : The compound cyclooctane has the following structural formula :

Hydrocarbons

Reason (R) : (4n + 2) π electrons rule does not hold good and ring is not planar.

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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