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NEET levelSingle correct optionDifficulty 1 of 3bm058

The zwitterionic (dipolar ion) form of glycine is represented by

A $H X_{3} N X^{+} - CH X_{2} - COOH$
B $H X_{2} N - CH X_{2} - COO X^{-}$
C $H X_{2} N - CH X_{2} - COOH$
D $H X_{3} N X^{+} - CH X_{2} - COO X^{-}$

Answer: D

In the zwitterion the carboxyl group has lost a proton to the amino group, giving

- COO -

and

- NH X_{3} X^{+}

in the same molecule with zero net charge. The other three are the neutral uncharged form, the cation and the anion.

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