NCERT Class XII Chemistry
Chapter - Biomolecules
Questions with Solutions
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Question : 29
Total: 33
The melting points and solubility in water of amino acids are higher than those of the corresponding haloacids. Explain.
Solution:
The amino acids exist as zwitter ions, H 3 N + — O H R — C O O — . Because of this dipolar salt like character they have strong dipole-dipole attractions. So, their melting points are higher than halo acids which do not have sail like character. Moreover, due tothis salt like character, they interact strongly with H 2 O . Thus, solubility of amino acids in water is higher than that of the corresponding halo acids which do not have salt like character.
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