1.

At pH = 4, glycine exists as

Answer»

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

SOLUTION :At pH = 4 (i.e. acidic MEDIUM), an amphoteric Zqitter ion structure CHANGES into cation when an ACID is added to it.
`underset(""^(o+)NH_(3))underset("|")(R )-CH-COO^(Ө)+H^(+)rarr underset(""^(o+)NH_(3))underset("|")(R )-CH-COOH`


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