# Which of the following sequences is correct?

1. A

$\mathrm{p}{K}_{\mathrm{a}}^{\circ }\left(p-{\mathrm{O}}_{2}{\mathrm{NC}}_{6}{\mathrm{H}}_{4}\mathrm{COOH}\right)>\mathrm{p}{K}_{\mathrm{a}}^{\circ }\left({\mathrm{C}}_{6}{\mathrm{H}}_{5}\mathrm{COOH}\right)>\mathrm{p}{K}_{\mathrm{a}}^{\circ }\left(p-{\mathrm{HOC}}_{6}{\mathrm{H}}_{4}\mathrm{COOH}\right)$

2. B

$\mathrm{p}{K}_{\mathrm{a}}^{\circ }\left(p-{\mathrm{O}}_{2}{\mathrm{NC}}_{6}{\mathrm{H}}_{4}\mathrm{COOH}\right)<\mathrm{p}{K}_{\mathrm{a}}^{\circ }\left({\mathrm{C}}_{6}{\mathrm{H}}_{5}\mathrm{COOH}\right)<\mathrm{p}{K}_{\mathrm{a}}^{\circ }\left(p-{\mathrm{HOC}}_{6}{\mathrm{H}}_{4}\mathrm{COOH}\right)$

3. C

$\mathrm{p}{K}_{\mathrm{a}}^{\circ }\left(p-{\mathrm{O}}_{2}{\mathrm{NC}}_{6}{\mathrm{H}}_{4}\mathrm{COOH}\right)>\mathrm{p}{K}_{\mathrm{a}}^{\circ }\left({\mathrm{C}}_{6}{\mathrm{H}}_{5}\mathrm{COOH}\right)<\mathrm{p}{K}_{\mathrm{a}}^{\circ }\left(p-{\mathrm{HOC}}_{6}{\mathrm{H}}_{4}\mathrm{COOH}\right)$

4. D

$\mathrm{p}{K}_{\mathrm{a}}^{\circ }\left(p-{\mathrm{O}}_{2}{\mathrm{NC}}_{6}{\mathrm{H}}_{4}\mathrm{COOH}\right)<\mathrm{p}{K}_{\mathrm{a}}^{\circ }\left({\mathrm{C}}_{6}{\mathrm{H}}_{5}\mathrm{COOH}\right)>\mathrm{p}{K}_{\mathrm{a}}^{\circ }\left(p-{\mathrm{HOC}}_{6}{\mathrm{H}}_{4}\mathrm{COOH}\right)$

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### Solution:

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

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