Previous Year Questions (2014-19) - Haloalkanes and Haloarenes Notes | EduRev

Chemistry Class 12

Class 12 : Previous Year Questions (2014-19) - Haloalkanes and Haloarenes Notes | EduRev

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Q.1. Which of the following alkane cannot be made in good yield by Wurtz reaction?    (2020)
A: n-Heptane
B: n-Butane
C: n-Hexane
D: 2,3-Dimethylbutane
Ans: 
A
Wurtz reaction is used to prepare symmetrical alkane.

Q.2. Elimination reaction of 2-Bromo-pentane to form pent-2-ene is:    (2020)
(a) b-Elimination reaction
(b) Follows Zaitsev rule
(c) Dehydrohalogenation reaction
(d) Dehydration reaction
A: 
(b), (c), (d)
B: (a), (b), (d) 
C: 
(a), (b), (c)
D: (a), (c), (d)
Ans: 
C
Previous Year Questions (2014-19) - Haloalkanes and Haloarenes Notes | EduRev
In the reaction
(i) Dehydrohalogenation  
(ii) β - elimination reaction
(iii) follows zaitsev rule (highly substituted alkene is formed as major product)

Q.3. Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is    (2018)
A: CH≡CH
B: CH2=CH2
C: CH3–CH3
D: CH4
Ans: D

Previous Year Questions (2014-19) - Haloalkanes and Haloarenes Notes | EduRev

Q.4. Identify A and predict the type of reaction    (2017)
Previous Year Questions (2014-19) - Haloalkanes and Haloarenes Notes | EduRev
A:Previous Year Questions (2014-19) - Haloalkanes and Haloarenes Notes | EduRev
B:Previous Year Questions (2014-19) - Haloalkanes and Haloarenes Notes | EduRev
C:Previous Year Questions (2014-19) - Haloalkanes and Haloarenes Notes | EduRev
D:Previous Year Questions (2014-19) - Haloalkanes and Haloarenes Notes | EduRev
Ans: 
D
Previous Year Questions (2014-19) - Haloalkanes and Haloarenes Notes | EduRev

Q.5. For the following reaction :    (2016)
Previous Year Questions (2014-19) - Haloalkanes and Haloarenes Notes | EduRev
Which of the following statements is correct ?
A: (a) is substitution, (b) and (c) are addition reactions.
B: (a) is elimination, (b) and (c) are substitution reactions.
C: (a) is elimination, (b) is substitution and (c) addition reaction.
D: (a) and (b) are elimination reactions and (c) is addition reaction.
Ans:
C
Previous Year Questions (2014-19) - Haloalkanes and Haloarenes Notes | EduRev

Q.6. Which of the following compounds will undergo racemisation when solution of KOH    (2014)
hydrolyses ?

Previous Year Questions (2014-19) - Haloalkanes and Haloarenes Notes | EduRev
A: (iii) and (iv)
B: (i) and (iv)
C: (i) and (ii)
D: (ii) and (iv)
Ans:
B
Correct option (None)
Due to chirality
Previous Year Questions (2014-19) - Haloalkanes and Haloarenes Notes | EduRev
Only compound (iv) will undergo racemisation. Hence, all the given options are incorrect.

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