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Why alkyl halides are generally not prep...

Why alkyl halides are generally not prepared in the laboratory by free radical halogenation of alkanes?

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Free radical halogenation is not a suitable method for lobaratory synthesis of alkyl halides because of the following two reasons:
(i) It gives a mixture of isomeric monohalogenated products whose boiling ponints are so close that they cannot be easily separated in the laboratory.
(ii) Polyhalogenation may also occur to some extent thereby making the mixture more complex and hence more difficult to separate.
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Alkyl Halides Preparation

The alkyl halides that can be made by free radical halogenation of alkanes are :

Knowledge Check

  • phosphine is generally prepared in the laboratory

    A
    By heating phosphorus in a current of hydrogen
    B
    By heating white phosphorus with aqueous solution of caustic potash
    C
    By decomposition of `P_(2)H_(4)` at `110^(@)C`
    D
    `By heating red phosphorus with an aqueous solution of caustic soda

  • Phosphine is generally prepared in the laboratory

    A
    By heating phosphorus in a current of hydrogen
    B
    By decomposition of `P_(2)H_(4)` at 110
    C
    By heating red phosphorus with an aquesous solution of caustic soda
    D
    By heating white phosphors with caustic potash

  • Which statement is incorrect about free radical halogenation of alkanes ?

    A
    The number of product molecules formed by one photon is very high.
    B
    If `O_(2)` is added , initially the rate of reaction decreases, then increases.
    C
    Inhibitors combine with free radical and terminate the chain reaction.
    D
    Presence of `C_(6)H_(5)-underset(O)underset(||)(C )O-underset(O)underset(||)(OC)-C_(6)H_(5)` inhibits the free radical reaction.

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