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In free radical halogenations of alkanes, which of the following is true? a. bromine is highly...

In free radical halogenations of alkanes, which of the following is true?

a. bromine is highly regioselective          b. bromine is highly stereoselective       

c. chlorine is highly regioselective                       d. chlorine is highly stereoselective

e. more than one choice is correct.

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Answer #1

In free radical halogenations of alkanes, chlorine is highly regioselective because of the following reasons

The reactivity of the different halogens varies considerably. The relative rates are: fluorine(108) > chlorine (1) > bromine (7 × 10−11) >iodine (2 × 10−22). Hence the reaction of alkanes with fluorine is difficult to control, chlorine is moderate to fast, bromine is slow and requires high levels of UV irradiation while the reaction with iodine is practically nonexistent

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