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Question

Give the decreasing order of the reaction rates of the following benzyl alcohol with HBr.



A
I>II>III>IV
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B
IV>I>III>I
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C
II>I>III>IV
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D
IV>III>I>II
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Solution

The correct option is A I>II>III>IV
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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