(a) Write the structures of alanine at `pH = 2` and `pH = 10`
(b) Identify `A,B` and `C` and given their structures.
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Answer

(a) `CH_(3)-underset(underset(NH_(2)("Alanine"))(|))(CH)-COOH`
`P^(H)=2` (Basic group is ionised) `overset("Structure of alanine pH=10")(CH_(3)-underset(underset(.^(oplus)NH_(3))(|))(CH)-COO^(-))`
`P^(11) =10` (Acidic group in ionised) `overset("Structure of alanine pH=10")(CH_(3)-underset(underset(.^(NH_(3)))(|))(CH)-COO^(-))`.