Question

The melting points and solubility of amino acids in water are generally higher than that of the corresponding halo acids. Explain

Answer 1

The amino acids have a strong peptide linkage so its bonds never break and their melting points are also higher but the halo acids e.
Carboxylic acid's derivative have the tendency to make and break the bonds so they easily soluble....

Answer 2

Both acidic (carboxyl) as well as basic (amino) groups are present in the same molecule of amino acids. In aqueous solutions, the carboxyl group can lose a proton and the amino group can accept a proton, thus giving rise to a dipolar ion known as a zwitter ion.

Due to this dipolar behaviour, they have strong electrostatic interactions within them and with water. But halo-acids do not exhibit such dipolar behaviour.

For this reason, the melting points and the solubility of amino acids in water is higher than those of the corresponding halo-acids.