Which of the following sequences is correct?

  1. A

    pKapO2NC6H4COOH>pKaC6H5COOH>pKapHOC6H4COOH

  2. B

    pKapO2NC6H4COOH<pKaC6H5COOH<pKapHOC6H4COOH

  3. C

    pKapO2NC6H4COOH>pKaC6H5COOH<pKapHOC6H4COOH

  4. D

    pKapO2NC6H4COOH<pKaC6H5COOH>pKapHOC6H4COOH

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    Solution:

    Electron-attracting group makes benzoic acid more strong acidic and electron-releasing group makes it less acidic. The  pKa follows the reverse order.

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