CBSE Class 12th Chemistry Chapter 6 - Haloalkanes and Haloarenes Important Questions with Answers
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Write the structure of l-Bromo-4-chlorobut-2-ene. (Delhi 2017)
Question 2.
Write the structure of 2, 4-dinitrochlorobenzene. (Delhi 2017)
Question 3.
Out of which is an example of allylic halide? (All India 2017)
Question 4.
Out of which is an example of vinylic halide? (All India 2017)
Question 5.
Out of
which is an example of a benzylic halide? (All India 2017)
Question 6.
Which alkyl halide from the following pair is (i) Chiral and (ii) undergoes SN2 reaction faster? (Comptt. Delhi 2017)
Question 7.
Which alkyl halide from the following pair is (i) Chiral and (ii) undergoes SN1 reaction faster?
(a) (CH3)2CBr
(b) CH3CH2CHBrCH3 (Comptt. Delhi 2017)
Question 8.
Following compounds are given to you:
2-Bromopentane, 2-Bromo-2-methylbutane, 1-Bromopentane
(i) Write the compound which is most reactive towards SN2 reaction.
(ii) Write the compound which is optically active.
(iii) Write the compound which is most reactive towards ? – elimination reaction. (Delhi 2017)
Question 9.
Write structures of compounds A, B and C in each of the following reactions: (Delhi 2017) >
Question 10.
The following compounds are given to you:
2-Bromopentane, 2-Bromo-2-methylbutane, 1-Bromopentane
(i) Write the compound which is most reactive towards SN2 reaction.
(ii) Write the compound which is optically active.
(iii) Write the compound which is most reactive towards P-elimination reaction. (All India 2017)
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Question 1.
(a) Write the structural formula of A, B, C and D in the following sequence of reaction:
(b) Illustrate Sandmeyer’s reaction with the help of a suitable example. (Comptt. Delhi 2017)
Question 2.
(a) Account for the following :
(i) Electrophilic substitution reactions in haloarenes occur slowly.
(ii) Haloalkanes, though polar, are insoluble in water.
(b) Arrange the following compounds in increasing order of reactivity towards SN2 displacement:
2-Bromo-2-Methylbutane, 1-Bromopentane, 2-Bromopentane (Comptt. All India 2017)
Question 3.
Out of
which is more reactive towards SN1 reaction and why? (Delhi 2016)
Question 4.
Write the structure of an isomer of compound C4H9Br which is most reactive towards SN1 reaction. (All India 2016)
CH3
Question 5.
Write the equations for the preparation of 1-bromobutane from :
(i) 1-butanol (ii) but-l-ene (Comptt. All India 2016)
Question 6.
Which compound in each of the following pairs will react faster in SN2 reaction with —OH?
(i) CH3Br or CH3I (ii) (CH3)3 CCl or CH3Cl (Comptt. All India 2016)
Question 7.
Give reasons: (Delhi 2016)
(i) C—Cl bond length in chlorobenzene is shorter than C—Cl bond length in CH3—Cl.
(ii) The dipole moment of chlorobenzene is lower than that of cyclohexyl chloride.
(iii) SN1 reactions are accompanied by racemization in optically active alkyl halides.
Question 8.
How do you convert: (All India 2016)
(i) Chlorobenzene to biphenyl
(ii) Propene to 1-iodopropane
(iii) 2-bromobutane to but-2-ene
Question 9.
Write the major product(s) in the following: (All India 2016)
Question 10.
In the following pairs of the halogen compounds which compound undergoes faster SN1 reaction. (Comptt. Delhi 2016)
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Other CBSE Class 12th Chemistry Chapter Wise Questions
which is an example of allylic halide? (All India 2017)
which is an example of vinylic halide? (All India 2017)
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