Question
What are the $a-$amino acids?

Answer

$\alpha$-Amino acids are carboxylic acids having an amino $\left(NH _2\right)$ group bonded to the $\alpha-$carbon, i.e. the carbon next to the carboxyl $(COOH )$ group.
Image
$\alpha-$amino acids are derivatives of carboxylic acids, obtained by replacing $- H$ atom by amino group.
They are bifunctional compounds containing acidic Image and basic $NH_2$ groups.
Example : Image $($where $R$ is an alkyl group or aryl group$).$
The amino acids are colourless, crystalline, water soluble, high melting solids. These acids in their
aqueous solutions behave like salts due to presence of both acidic, Image and basic. $(NH_2)$ groups in the same molecule.
Such a doubly charged ion is known as zwitter ion. Example : Image
Image

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