As partune, an artifical sweetener, is a peptide and has the following structure:

Identify the four functional groups.

Explanation

i. Four fuctional groups are:
a. Amine group `(-NH_(2))`.
b. Carboxylic acid group `(-COOH)`.
c. Amide group `(-overset(O)overset(||)(C )-NH-) (2^(@) "amide") ("perptide bond")`
d. Ester group `(COOCH_(3))`.
Zwitterion structure:
iii.
iv. `(B)` is more hydrophobic (less soluble in `H_(2)O`), due to large non-polar part mentioned in the dotted box.