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Aldehydes, Ketones, and Carboxylic Acids — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryAldehydes, Ketones, and Carboxylic Acids1 Mark
MCQ
Among the following acid which has the lowest pKa?
  • A
    CH3​CH2​COOH
  • B
    (CH3​)2​CH−COOH
  • C
    HCOOH
  • D
    CH3​COOH
✓

Answer

  1. HCOOH

Explanation:

$\text{Acidity} \alpha \frac{1}{\text{pKa}}\alpha \frac{1}{\text{+I−effect​}}$

Stronger the acid lower is the pK value. From the given acid HCOOH is the strongest acid as it do not have any +I group.

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