Arrange in order of decreasing reactivity of electrophilic addition.

II> I> IV> III

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III> IV> I> II

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III> I> IV> II

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II> IV> I> III

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Solution

The correct option is C III> I> IV> II
In electrophilic addition rection, in rate determining step carbocation is formed. Since stability of carbocation $↑ e s$ , reactivity towards electrophilic addition also $↑ e s$ .
The following carbocations are formed.

$Stability of carbocation \propto \frac{(+ R > + H > + I)}{(- R > - H > - I)}$

Hence, overall order of stability of carbocation is: III> I> IV> II

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