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  4. Mark the correct increasing order of reactivity of the following compounds with HBr/HCl.

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Q. Mark the correct increasing order of reactivity of the following compounds with $HBr/HCl$.Chemistry Question Image

Alcohols Phenols and Ethers

Solution:

The order of stability of benzyl carbocations is :
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The electron withdrawing effect of-$NO_2$ group is greater than that of $-Cl$ group.
Thus, the correct increasing order of reactivity with $HBr/HCl$ is : $(ii) < (iii) < (i)$.