Which of the following reactions yield carboxylic acids. (A) ( RMgX + CO ₂ H ₂ O ) (B) ( Ph - OH + NaOH + CO ₂ ) (C) ( PhCN + H ₃ O ^ ) (D) ( PhOH + CHCl ₃+ KOH )

Step-by-step solution

(A) ( RMgX + CO ₂ ) (on hydrolysis) ( R - COOH ) Yes, this is a standard reaction of Grignard reagent with ( CO ₂ ), giving carboxylic acid. (B) ( Ph - OH + NaOH + CO ₂ ) Salicylic acid (Kolbe-Schmitt reaction) Yes, this is the Kolbe reaction, which yields ortho-hydroxybenzoic acid (salicylic acid). (C) ( Ph - C N + H ₃ O ⁺ Ph - COOH ) Hydrolysis of nitriles in acidic medium gives carboxylic acids. (D) ( PhOH + CHCl ₃+ KOH ) Salicylaldehyde (Reimer-Tiemann reaction) This gives salicylaldehyde (-CHO group), not a ca