Write down the structures and names of the products obtained when $\mathrm{D}$-glucose is treated with bromine.

Give reasons for the following-

Amino acids have relatively higher melting point as compared to corresponding halo acids.

Give reasons for the following-

Amino acids are amphoteric in behaviour.

Give reasons for the following-

The mono-amino carboxylic acids have two ${\mathrm{pK}}_{\mathrm{a}}$ values.