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Aldehydes Ketones and Carboxylic Acids question

2025 · Q92
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Aldehydes Ketones and Carboxylic Acids question

2025 · Q92

NEETChemistryAldehydes Ketones and Carboxylic AcidsMCQ+4 / −1

The correct order of decreasing acidity of the following aliphatic acids is

  1. A
    HCOOH>CH3COOH>(CH3)2CHCOOH>(CH3)3CCOOH\mathrm{HCOOH}>\mathrm{CH}_3 \mathrm{COOH}>\left(\mathrm{CH}_3\right)_2 \mathrm{CHCOOH}>\left(\mathrm{CH}_3\right)_3 \mathrm{CCOOH}HCOOH>CH3​COOH>(CH3​)2​CHCOOH>(CH3​)3​CCOOH
  2. B
    HCOOH>(CH3)3CCOOH>(CH3)2CHCOOH>CH3COOH\mathrm{HCOOH}>\left(\mathrm{CH}_3\right)_3 \mathrm{CCOOH}>\left(\mathrm{CH}_3\right)_2 \mathrm{CHCOOH}>\mathrm{CH}_3 \mathrm{COOH}HCOOH>(CH3​)3​CCOOH>(CH3​)2​CHCOOH>CH3​COOH
  3. C
    (CH3)3CCOOH>(CH3)2CHCOOH>CH3COOH>HCOOH\left(\mathrm{CH}_3\right)_3 \mathrm{CCOOH}>\left(\mathrm{CH}_3\right)_2 \mathrm{CHCOOH}>\mathrm{CH}_3 \mathrm{COOH}>\mathrm{HCOOH}(CH3​)3​CCOOH>(CH3​)2​CHCOOH>CH3​COOH>HCOOH
  4. D
    CH3COOH>(CH3)2CHCOOH>(CH3)3CCOOH>HCOOH\mathrm{CH}_3 \mathrm{COOH}>\left(\mathrm{CH}_3\right)_2 \mathrm{CHCOOH}>\left(\mathrm{CH}_3\right)_3 \mathrm{CCOOH}>\mathrm{HCOOH}CH3​COOH>(CH3​)2​CHCOOH>(CH3​)3​CCOOH>HCOOH
View written solutionFree

Correct answer: A

Electron donating group decreases the acidity of carboxylic acids.

So correct order is

$$\mathrm{HCOOH}>\mathrm{CH}_3 \mathrm{COOH}>\left(\mathrm{CH}_3\right)_2 \mathrm{CHCOOH}>\left(\mathrm{CH}_3\right)_3 \mathrm{CCOOH}$$

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