Alcohols Phenols And Ethers Ques 47
47. The compound that is most difficult to protonate is :
[2019]

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Answer:
Correct Answer: 47.(d)
Solution:

lone pair of $e^{-s}$ present on oxygen atom is involved in delocalisation. Therefore, it is most difficult to protonate the phenol amongst the given compounds, due to less availability of e-s.