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Alcohols, Phenols and Ethers
Question
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which one of the following is most reactive towards electrophilic attack? 


Answer

C.

Electron releasing groups stabilise the intermediate cation whereas electron withdrawing groups destabilise it.
The order of electron withdrawing group is:
NO2 > Cl >OH> C6H5
Hence is more reactive towards electrophilic substitution because -OH group least destabilise the carbocation. Further -OH group is strongly activating group while -NO2 and -Cl are deactivating group.

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