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**Kolbe's reaction** (Kolbe-Schmitt) converts sodium phenoxide into:

ASalicylic acid (ortho-hydroxybenzoic acid)
BAcetic acid
CMethanoic acid
DBenzoic acid
Answer & Solution
Correct answer: A. Salicylic acid (ortho-hydroxybenzoic acid)
Kolbe-Schmitt: PhONa + CO₂ (gaseous, 4-7 atm, 125 °C), then H⁺ → 2-hydroxybenzoic acid (salicylic acid). Industrial route to salicylic acid (precursor to aspirin = acetylsalicylic acid).
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