Question
α – Amino acids have high melting points compared to the corresponding amines or carboxylic acids of comparable molecular mass. Give scientific reasons.
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Answer
α – Amino acids have high melting points compared to the corresponding amines or carboxylic acids of comparable molecular mass.
α-Amino acids have high melting points compared to the corresponding amines or carboxylic acids of comparable molecular mass due to the presence of both acidic (carboxylic group) and basic (amino group) groups in the same molecule. In aqueous solution, proton transfer from acidic group to amino (basic) group of amino acid forms a salt, which is a dipolar ion called zwitter ion.
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