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KCET 2021 Chemistry Solved Paper
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© examsnet.com
Question : 52
Total: 60
Peroxide effect is observed with the addition of HBr but not with the addition of HI to unsymmetrical alkene because
H
−
I
bond is stronger than
H
−
Br
and is not cleaved by the free radical
H
−
I
bond is weaker than
H
−
Br
bond so that iodine free radicals combine to form iodine molecules
Bond strength of HI and HBr are same but free radicals are formed in HBr
All of the above
Validate
Solution:
Peroxide effect is observed with addition of HBr but not with the addition of
H
−
I
to unsymmetrical alkene because H - I bond is weaker than H-Br bond. So, unstable iodine free radicals combine to form stable iodine molecules as
i.e.,
I
●
+
I
●
(
Unstable
)
Free
radicals
→
I
2
(
Stable
)
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