Question

Which of the following is the strongest acid ?

• A. $C_6{H}_{5}OH$
• B. $C{H}_{3}C{H}_{2}OH$
• C. $C_6{H}_{5}S{O}_{3}H$
• D. $C_6{H}_{5}COOH$

Answer 1

Answer: (C)

Benzene sulphonic acid is strongest acid as benzene sulphonate anion as three equivalent resonating structures as compared to two in carboxylic acid.