Which is most reactive towards electrophilic reagent?

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Solution

The correct option is A
The most reactive towards electrophilic reagent is o-cresol (compound in a).
The phenolic $- O H$ group increases the electron density of benzene ring through resonance.
With increase in the electron density, the reactivity towards electrophilic reagent increases.
The decreasing order of the activating influence of the substituents towards electrophillic reagent is:
$- N R_{2} > - N H R > - N H_{2} > - O H > - O R > - N H C O R > - P H > - R$

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