Organic compounds having phenolic -OH,-COOH and -SO3 H groups show acidic character. The strengt

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Organic compounds having phenolic -OH,-COOH and -SO3 H...

Organic compounds having phenolic $-\mathrm{OH},-\mathrm{COOH}$ and $-\mathrm{SO}_3 \mathrm{H}$ groups show acidic character. The strength of acid is dependent on inductive effect and measomeric effect. The acidic strength of ortho substituted benzoic acids are explained by ortho effect. Strongest acid among the following is (a)-(c) Compound can't copy (d) $\mathrm{CH}_3 \mathrm{COOH}$

Organic compounds having phenolic $-\mathrm{OH},-\mathrm{COOH}$ and $-\mathrm{SO}_3 \mathrm{H}$ groups show acidic character. The strength of acid is dependent on inductive effect and measomeric effect. The acidic strength of ortho substituted benzoic acids are explained by ortho effect.
Strongest acid among the following is
(a)-(c) Compound can't copy
(d) $\mathrm{CH}_3 \mathrm{COOH}$

Key Concepts

Mesomeric (Resonance) Effect

The mesomeric or resonance effect involves the delocalization of electrons across a molecule through overlapping p-orbitals. This delocalization can stabilize the conjugate base by dispersing the negative charge over multiple atoms, thereby increasing the acidity. Depending on the nature of the substituent, the resonance effect can either donate or withdraw electron density, impacting acid strength.

Ortho Effect

The ortho effect refers to the phenomenon where substituents attached to the ortho position of aromatic carboxylic acids lead to an unexpected increase in acidity, beyond what is predicted by classical electronic effects alone. This effect stems from a combination of steric hindrance, which can disrupt resonance stabilization of the carboxylate group, and electronic interactions that stabilize the conjugate base, thereby increasing the acid strength.

Acidic Strength in Organic Compounds

This concept revolves around the ability of a molecule to donate a proton, which is largely dictated by the stability of its conjugate base. In organic molecules, functional groups like -OH in phenols, -COOH in carboxylic acids, and -SO3H in sulfonic acids can lose a proton, and the factors that stabilize the resulting anion greatly influence the overall acid strength.

Inductive Effect

The inductive effect is the transmission of charge through bonds, usually via sigma bonds, due to the electronegativity differences between atoms. Electronegative substituents can pull electron density away from acidic sites, stabilizing the negative charge on the conjugate base, and consequently enhancing the acid strength.

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