The compound that is most difficult to proton | vedclass

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(D) Protonation involves the donation of a lone pair of electrons from the oxygen atom to a proton $(H^+)$. Compounds with higher electron density on

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$PhOH$

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(D) Protonation involves the donation of a lone pair of electrons from the oxygen atom to a proton $(H^+)$. Compounds with higher electron density on the oxygen atom are more basic and easier to protonate. In $PhOH$ (phenol),the lone pair of electrons on the oxygen atom is delocalized into the benzene ring due to resonance. This delocalization reduces the electron density on the oxygen atom,making it the least basic and therefore the most difficult to protonate among the given options.

The compound that is most difficult to protonate is

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