A) amino acids exist as zwitter ions resulting in strong dipole - dipole attraction
B) amino acids are optically active
C) due to higher molecular mass of \[-N{{H}_{2}}\] group molecular mass of amino acids is higher
D) they interact with water more than halo - acids and have salt like structure.
Correct Answer: A
Solution :
Amino acids exist as zwitter ions, \[{{H}_{3}}{{N}^{+}}-OHR-CO{{O}^{-}}\] Because of this dipolar salt-like character, they have strong dipole-dipole attractions. Hence, their melting points are higher then halo-acids.
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