Alcohols Phenols and EthershardMCQ SINGLE

Based on the inductive and resonance effects of substituents, which of the following compounds exhibAlcohols Phenols and Ethers Chemistry Question

Question

Based on the inductive and resonance effects of substituents, which of the following compounds exhibits the strongest acidic character (lowest $pK_a$)?

Answer: C

💡 Solution & Explanation

The acidity of phenols depends on the stability of the phenoxide conjugate base. Electron-withdrawing groups (EWGs) like $-NO_2$ stabilize the negative charge through resonance and the -I effect, significantly increasing acidity. Electron-donating groups (EDGs) like the methyl group in p-cresol destabilize the anion, decreasing acidity. Alcohols are far less acidic than any phenols.

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