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  4. Isobutyl bromide may be obtained from isobutylene and HBr in the presence of

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Q. Isobutyl bromide may be obtained from isobutylene and HBr in the presence of

CMC MedicalCMC Medical 2007

Solution:

The reaction occurs only in the presence of peroxides because hydroquinone and diphenyl amine, are in fact radical scavengers. $ \underset{isobutylene}{\mathop{C{{H}_{3}}-\overset{C{{H}_{3}}}{\mathop{\overset{\mathbf{|}}{\mathop{C}}\,}}\,=C{{H}_{2}}}}\,\xrightarrow[peroxide]{HBr}\underset{isobutyl\,bromide}{\mathop{C{{H}_{3}}-\overset{C{{H}_{3}}}{\mathop{\overset{\mathbf{|}}{\mathop{CH}}\,}}\,-C{{H}_{2}}Br}}\, $