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NEET-XII-Chemistry

01: Haloalkanes and Haloarenes

 page 3
 
  • Ans :

    The alkyl halide (I) is 2° while (II) is 1°. 2° carbocation is more stable than 1° carbocation. Therefore, (I), 2-chloroheptane, undergoes faster SN1 reaction than (II), 1-chlorohexane.
  • Qstn #9
    Identify A, B, C, D, E, R and R1 in the following:


    Ans :

    Since D of D2O gets attached to the carbon atom to which MgBr is attached, C is



    Therefore, the compound R - Br is



    When an alkyl halide is treated with Na in the presence of ether, a hydrocarbon containing double the number of carbon atoms as present in the original halide is obtained as product. This is known as Wurtz reaction. Therefore, the halide, R1-X, is



    Therefore, compound D is



    And, compound E is


  • #
    Section : II
    SECTION I Page No 310:
  • Qstn #1
    Name the following halides according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:
  • Qstn #1-i
    (CH3)2CHCH(Cl)CH3
    Ans :

    2-Chloro-3-methylbutane

    (Secondary alkyl halide)
  • Qstn #1-ii
    CH3CH2CH(CH3)CH(C2H5)Cl
    Ans :

    3-Chloro-4-methyhexane

    (Secondary alkyl halide)
  • Qstn #1-iii
    CH3CH2C(CH3)2CH2I
    Ans :

    1-Iodo-2, 2 -dimethylbutane

    (Primary alkyl halide)
  • Qstn #1-iv
    (CH3)3CCH2CH(Br)C6H5
    Ans :

    1-Bromo-3, 3-dimethyl-1-phenylbutane

    (Secondary benzyl halide)
  • Qstn #1-ix
    CH3CH=CHC(Br)(CH3)2
    Ans :

    4-Bromo-4-methylpent-2-ene

    (Allyl halide)
  • Qstn #1-v
    CH3CH(CH3)CH(Br)CH3
    Ans :

    2-Bromo-3-methylbutane

    (Secondary alkyl halide)
  • Qstn #1-vi
    CH3C(C2H5)2CH2Br
    Ans :

    1-Bromo-2-ethyl-2-methylbutane

    (Primary alkyl halide)
  • Qstn #1-vii
    CH3C(Cl)(C2H5)CH2CH3
    Ans :

    3-Chloro-3-methylpentane

    (Tertiary alkyl halide)
  • Qstn #1-viii
    CH3CH=C(Cl)CH2CH(CH3)2
    Ans :

    3-Chloro-5-methylhex-2-ene

    (Vinyl halide)
  • Qstn #1-x
    p-ClC6H4CH2CH(CH3)2
    Ans :

    1-Chloro-4-(2-methylpropyl) benzene

    (Aryl halide)
  • Qstn #1-xi
    m-ClCH2C6H4CH2C(CH3)3
    Ans :

    1-Chloromethyl-3-(2, 2-dimethylpropyl) benzene

    (Primary benzyl halide)
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