Arrange the following according to decreasing order of reactivity towards $H B r$ .

I > I I > I I I

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I I > I > I I I

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I I I > I > I I

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I I I > I I > I

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Solution

The correct option is A $I > I I > I I I$
More the electron-donating ability of substituent more is the stability of carbocation. Hence more will be reactivity towards electrophilic addition reaction with HBr.

Among I, II and III, electron-donating ability order is:

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