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The melting points and solubility in wat...

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

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The amino acids exist as zwitterions, `H_(3) overset(+)(N)-CHR-COO^(-)`. Due to this dipolar salt like character they have strong dipole - dipole attractions or electrostatic attractions . Therefore, their melting points are higher than haloacids which do not have salt like character. Further , due to salt like character , they intersect strongly with `H_(2)O`. As a result , solubility in water of amino acids is higher than that of the corresponding haloacids which do not have salt like character.
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