a. i. What is the general structural formula of a 2-amino-carboxylic acid?

ii. Why are all amino acids solids at 20°C?

b. i. Draw the displayed formula of the 2-aminocarboxylic acid called serine, in which the R group is HO—CH₂— .

ii. Draw the structure of the zwitterion of serine.

iii. Draw the structure of the ion of serine present in acidic conditions.

iv. Draw the structure of the ion of serine present in alkaline conditions.