Q59 / 180 · KCET 2011 · Chemistry

In an alkaline medium, glycine predominantly exists as/in a/an

A
cation
Correct answer
B
anion
C
Zwitter ion
D
covalent form

Solution

In alkaline medium (high pH) amino acids exists as negatively charged particle (carboxyl group donates proton). $$ \mathrm{H}_{2} \mathrm{~N}-\mathrm{CH}_{2}-\mathrm{COOH} \underset{\mathrm{H}_{2} \mathrm{~N}-\mathrm{CH}_{2}-\mathrm{COO}}{\stackrel{\text { High pH }}{\longrightarrow}} $$

Hence, the correct answer is option: 'B'.

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