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At pH 4, glycine exists as...

At pH 4, glycine exists as

A

`H_(3)overset(+)(N)-CH_(2)-COO^(-)`

B

`H_(3)overset(+)(N)-CH_(2)-COOH`

C

`H_(2)N -CH_2-COOH`

D

`H_2N -CH_(2)-COO^(-)`

Text Solution

Verified by Experts

The correct Answer is:
B
At pH=4 (i.e. acidic medium), an amphoteric Zwitter ion structure changes into cation when an acid is added to it
`underset(.^(o+)NH_(3))underset(|)(R)-CH-COO^(-)+H^(+) to underset(.^(o+)NH_(3))underset(|)(R)-CH-COOH`
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