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    "Butane, C4H10, reacts with Cl2 to form a mixture of chlorinated products

    One possible product is C4H9Cl

    C4H10 + Cl2 --> C4H9Cl + HCl

    (i) State the conditions: UV light and excess Cl2 to lower further substitution

    (ii) Write equations to show the mechanism of this reaction. Stuck on this!!

    (iii) Write one equation for a reaction that would terminate this mechanism.

    (iv) State the type of bond fission involved in the initiation step: Heterolytic fission.

    Please help!!!

    Thanks
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    (Original post by matt_copas)
    "Butane, C4H10, reacts with Cl2 to form a mixture of chlorinated products

    One possible product is C4H9Cl

    C4H10 + Cl2 --> C4H9Cl + HCl

    (i) State the conditions: UV light and excess Cl2 to lower further substitution

    (ii) Write equations to show the mechanism of this reaction. Stuck on this!!

    (iii) Write one equation for a reaction that would terminate this mechanism.

    (iv) State the type of bond fission involved in the initiation step: Heterolytic fission.

    Please help!!!

    Thanks
    Hey read up on free radical chlorination. This might help.

    http://www.chemguide.co.uk/mechanism...ch4andcl2.html
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    (Original post by shengoc)
    Hey read up on free radical chlorination. This might help.

    http://www.chemguide.co.uk/mechanism...ch4andcl2.html
    ATM ive got:

    (iii) Cl2 ---> 2[Cl] ([] is radical coz thats what im using to represent it :P)

    C4H10 + 2[Cl] --> C4H9Cl + HCl

    Am i missing something?
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    (Original post by matt_copas)
    ATM ive got:

    (iii) Cl2 ---> 2[Cl] ([] is radical coz thats what im using to represent it :P)

    C4H10 + 2[Cl] --> C4H9Cl + HCl

    Am i missing something?
    Very commonly, people often write

    C4H10 + [Cl] --> [C4H9] + HCl PROPAGATION
    [C4H9] + Cl2 ---> C4H9CL + [Cl] PROPAGATION

    Then, for termination, you could write
    2[C4H9] ----> C8H18
    etc
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    (Original post by shengoc)
    Very commonly, people often write

    C4H10 + [Cl] --> [C4H9] + HCl PROPAGATION
    [C4H9] + HCl ---> C4H9CL + [Cl] PROPAGATION

    Then, for termination, you could write
    2[C4H9] ----> C8H18
    etc
    I think you meant:


    [C4H9] + Cl2 ---> C4H9Cl + [Cl] PROPAGATION
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    (Original post by charco)
    I think you meant:


    [C4H9] + Cl2 ---> C4H9Cl + [Cl] PROPAGATION
    yup, weaker Cl-Cl bond over H-Cl bond
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    (Original post by shengoc)
    yup, weaker Cl-Cl bond over H-Cl bond
    well that and the fact that a hydrogen atom disappeared and an extra chlorine appeared in the products!
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    part (iv) is Homolytic not heterolytic. the Cl-Cl bond breaks so that each Cl atom gains an electron
 
 
 
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