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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) 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

[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

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?

[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.

[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.

[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:

[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?

[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?

[A] (i)
[B] (ii)
[C] (iii)
[D] (iv)
Answer: C, D
(13) Which are the correct IUPAC names of the following compound?

[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?

[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?

[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.

[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 :

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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