The strongest acid amongst the following compounds is

  • Option 1)

    CH_{3}COOH\;

  • Option 2)

    \; \; HCOOH\;

  • Option 3)

    \; CH_{3}CH_{2}CH(Cl)CO_{2}H\;

  • Option 4)

    \; ClCH_{2}CH_{2}CH_{2}COOH

 

Answers (2)

As we 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.

-

 

 CH_{3}CH_{2}CH(Cl)CO_{2}H

\alpha - chlorobutyric \: acid is more stronger acid than others due to -I effect (electron withdrawing group) of Cl


Option 1)

CH_{3}COOH\;

This option is incorrect

Option 2)

\; \; HCOOH\;

This option is incorrect

Option 3)

\; CH_{3}CH_{2}CH(Cl)CO_{2}H\;

This option is correct

Option 4)

\; ClCH_{2}CH_{2}CH_{2}COOH

This option is incorrect

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