Which of the following is strong acid?
Correct answer: B. F₂CHCOOH
- A. I₂CHCOOH
- B. F₂CHCOOH
- C. Br₂CHCOOH
- D. Cl₂CHCOOH
Explanation
The strength of an acid is influenced by the electronegativity of atoms attached to the carboxylic acid group. Fluorine is the most electronegative halogen, which increases the acidity of F₂CHCOOH due to its greater ability to stabilize the negative charge on the conjugate base. In contrast, iodine is the least electronegative, resulting in a weaker acid. Bromine and chlorine fall between fluorine and iodine in terms of electronegativity, making their corresponding acids of moderate strength.
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About Acids, Bases and Salts
Acid and base behaviour is explained through the Bronsted-Lowry transfer of protons and the Lewis donation or acceptance of electron pairs. The topic includes pH, pOH, ionisation and water equilibrium, plus salt formation and hydrolysis, where a salt solution may become acidic, basic or neutral.
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