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Which of the following sequences is correct?

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a
pKapO2NC6H4COOH>pKaC6H5COOH>pKapHOC6H4COOH
b
pKapO2NC6H4COOH<pKaC6H5COOH<pKapHOC6H4COOH
c
pKapO2NC6H4COOH>pKaC6H5COOH<pKapHOC6H4COOH
d
pKapO2NC6H4COOH<pKaC6H5COOH>pKapHOC6H4COOH

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detailed solution

Correct option is B

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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