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Chemical Properties of Alcohol

Give the decr...

Question

Give the decreasing order of the reaction rates of the following benzyl alcohol with $H B r$ .

I > I I > I I I > I V

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I V > I > I I I > I

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I I > I > I I I > I V

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I V > I I I > I > I I

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Solution

The correct option is A $I > I I > I I I > I V$
As there is formation of benzyl carbocation therefore +M and +I groups increase the stability as well as rate of the reaction and -M and -I decrease the stability as well as rate.

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