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Q.

The order of reactivity of alcohols towards hydrogen halide is

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a

benzyl > 3° > 2° > 1°

b

benzyl < 3° < 2° < 1°

c

3° > 2° > 1° > benzyl

d

3° > 2° > benzyl > 1°

answer is A.

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Detailed Solution

The more stable the generated carbocation, the more reactive it is. Resonance stabilisation occurs with the benzocation.

The order of reactivity of HX with ROH (alcohols towards hydrogen halide) is benzyl,

 > 3° > 2° > 1°

Thus the first option is correct.

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