Compound 'A' turns the blue litmus paper...

Compound 'A' turns the blue litmus paper red and gives voilet colour when treated with aqueous neutral ferric chloride solution. It reacts with chloroform in the presence of aqueous NaOH to give salicylaldehyde. Idetify the compound 'A' and name the reaction.

Phenol, Reimer-Tiemann reaction

o-Hydroxbenzoic acid, Reimer -Teimann reaction

p-Hydroxybenzoic acid, Stephen reaction

m-Hydroxybenzoic acid , Gattermann reaction

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