Question

a. What is the importance of Free radical reactions? b. Why bromination is more selective than...

a. What is the importance of Free radical reactions?
b. Why bromination is more selective than chlorination?
c. Why halogenation is not performed with Iodine or Fluorine?
d. There are different reagents used for free radical bromination. Discuss when Br2/ heat, HBr and peroxide and NBS are the reagent of choice.

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Answer #1

a) free radicals are single electrons species, which can easily under go bond formation reactions

b) reactivity of bromine is less as compared to chlorine, so selectivity for bromination is more than chlorination reactions

c) becasue of high electropositivity iodine can act as oxidising agent than iodinatiing agent, whereas fluorine is highly electronegative molecule, and highly reactive, reaction can not control under normal reaction condition

d) Br2/heat we can use when molecule contains double bond, HBr we can use it for conversion of alcohols to bromide

finally NBS we can use for bromination of allylic and benzylic site

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