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Arrange the following alkenes in...

Arrange the following alkenes


in decreasing order of their reactivity towards HBr.

A

IgtIIgtIII

B

IIgtIIIgtI

C

IIIgtIIgtI

D

IIIgtIgtII

Text Solution

Verified by Experts

The correct Answer is:
C
The reactivity depends upon the stability of the carbocation formed by addition of `H^(+)`. The carbocations resulting from alkenes (I,II and III) are respectively.

Since the stability decreases in the order: ZgtYgtX, therefore, reactivity decreases in the order: IIIgtIIgtI.
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