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