Which one among the following is known as Carbolic acid?

Correct option is A

The correct answer is (a) Phenol
Explanation:
• Phenol (C₆H₅OH) is historically called carbolic acid and was used as an antiseptic.
• It is more acidic than alcohols due to resonance-stabilised phenoxide ion.
• Used in disinfectants, resins, and pharmaceuticals.
Information Booster:
• Joseph Lister used phenol as surgical antiseptic in 19th century.
• Phenol is corrosive and must be handled with care.