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Question

Which one of the following is the strongest acid?


A

ClCH2COOH

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B

BrCH2COOH

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C

FCH2COOH

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D

ICH2COOH

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Solution

The correct option is C

FCH2COOH


Explanation for the correct option:

(c ) FCH2COOH

  • Because most strong acids have ions in solution, the bonds that hold H and A together must be weak. Strong acids quickly divide into ions. Weak acids frequently exist as molecules with only a few ions in solution, so the bonds that connect H and A must be solid.
  • Because the halogens' electron-withdrawing inductive action (-I effect) declines in the order F>Cl>Br>I,
  • As a result, the acidity of the α - halo acids decreases in the same order.
  • FCH2COOH>ClCH2COOH>BrCH2COOH>ICH2COOH
  • Hence this option is correct

Explanation for the incorrect options:

(a) ClCH2COOH

  • FCH2COOH is stronger acid than ClCH2COOH
  • Thus, this option is incorrect

(b)BrCH2COOH

  • FCH2COOH , ClCH2COOH is stronger acid than BrCH2COOH
  • Thus, this option is incorrect

(d) ICH2COOH

  • FCH2COOH , ClCH2COOH , BrCH2COOH is stronger acid than ICH2COOH
  • Thus, this option is incorrect

Hence the correct option is (c ) FCH2COOH


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