The correct order of decreasing acid strength or trichloroacetic acid (A), trifluroacetic acid (B), acetic acid (C) and formic acid (D) is:

  • Option 1)

    B>A>D>C

  • Option 2)

    B>D>C>A

  • Option 3)

    A>B>C>D

  • Option 4)

    A>C>B>D

 

Answers (1)

As learnt in

Acidic strength of carboxylic acid -

–  More acidic than phenols or alcohols.

–  Acidity increase with the presence of a group with  -I effect in the alkyl group.Whereas it decreases with the presence of  +I group.

–  Acidity increases with increase in the number of halogen atoms on \alpha - position.

–  It decreases with increasing distance of halogen from  -COOH 

–  It increases with increase in the electronegativity of halogen.

-

 

 CF3COOH > CCl3COOH > HCOOH > CH3 COOH


Option 1)

B>A>D>C

This option is correct

Option 2)

B>D>C>A

This option is incorrect

Option 3)

A>B>C>D

This option is incorrect

Option 4)

A>C>B>D

This option is incorrect

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