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

(N/A) 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.
$R-CH(NH_2)-COOH \leftrightarrow R-CH(NH_3^+)-COO^-$ ($Zwitter$ ion)
Due to this dipolar behavior,they have strong electrostatic interactions within them and with water.
However,halo-acids do not exhibit such dipolar behavior.
For this reason,the melting points and the solubility of amino acids in water are higher than those of the corresponding halo-acids.