The addition of HI in the presence of peroxide catalyst does not follow anti-Markovnikov's rule because:
HI is a strong reducing agent
H-I bond is too strong to be broken homolytically
I atom combines with H atom to give back HI
Iodine atom is not reactive enough to add across a double bond
Hydroiodination does not show Kharasch effect because Iodine free radicals formed readily combine with each other to form iodine molecules rather than attacking the double bond
Hence, the correct answer is Option (4)
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