Arrange the following in increasing order of acid strength:
Correct answer: D. CH3COOH < CH₂CICOOH < CHCI₂COOH < CCI2COOH
- A. CCI3COOH < CHCI₂COOH < CH₂CICOOH < CH3COOH
- B. CHCI2COOH < CH₂CICOOH < CH3COOH < CCI2COOH
- C. CH₂CICOOH < CH3COOH < CCI3COOH < CHCI₂COOH
- D. CH3COOH < CH₂CICOOH < CHCI₂COOH < CCI2COOH
Explanation
Acidity is enhanced by the presence of electron-withdrawing groups. The strength of the acid increases with the number of electron-withdrawing chlorine atoms attached to the alpha-carbon, as they increasingly stabilize the conjugate base through the inductive effect.
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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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