At pH = 4 glycine exists as

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At $\mathrm{pH}=4$ glycine exists as

ChemistryBiomoleculesCOMEDKCOMEDK 2018

Options:

A $\mathrm{H}_{3} \stackrel{+}{\mathrm{N}}-\mathrm{CH}_{2}-\mathrm{COO}^{-}$
B $\mathrm{H}_{3} \stackrel{+}{\mathrm{N}}-\mathrm{CH}_{2}-\mathrm{COOH}$
C $\mathrm{H}_{2} \mathrm{~N}-\mathrm{CH}_{2}-\mathrm{COOH}$
D $\mathrm{H}_{2} \mathrm{~N}-\mathrm{CH}_{2}-\mathrm{COO}^{-}$

Solution:

1713 Upvotes Verified Answer

The correct answer is: $\mathrm{H}_{3} \stackrel{+}{\mathrm{N}}-\mathrm{CH}_{2}-\mathrm{COOH}$

$\mathrm{At} \mathrm{pH}=4$, glycine reacts with $\mathrm{H}^{+}$ion as

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