The least acidic compound, among the following is:

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Canvas Classes · Accepted Answer

Step 1: Comparing Acidic Strength
Acidity depends on the stability of the conjugate base.
- Phenol: Resonace stabilized phenoxide ion.
- Sulfonic Acid (): Highly stabilized by resonance with three oxygens.
- Carboxylic Acid (): Stabilized by resonance with two oxygens.
- Terminal Alkyne (): The negative charge on -hybridized carbon is less stable than resonance-stabilized oxygens.

Step 2: Identifying the Least Acidic
Terminal alkynes () are significantly less acidic than carboxylic acids (), ph

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