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SSC CGL 2024 PYQ — Question 41

SSC CGL - 17 Sep 2024 - Shift 3 • General Awareness • Q41

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 Which of the following is the most acidic?

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Correct answer: A

Explanation

The correct answer is option 1 i.e. HCOOH.

  • The most acidic compound among the given options is formic acid (HCOOH). 
  • HCOOH (Formic acid): Strongest acid due to minimal electron-donating alkyl groups, enhancing H⁺ release.

Explanation:

  • CH₃COOH (Acetic acid): It is Weaker than HCOOH as the methyl group slightly stabilises the conjugate base.

  • C₂H₅COOH (Propionic acid) & C₃H₇COOH (Butyric acid): Even weaker acidity due to longer alkyl chains, which further disperse the negative charge on the conjugate base, reducing H⁺ dissociation.

Key factor: Acid strength decreases as alkyl chain length increases.