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(a) Write the product when D-glucose rea...

(a) Write the product when D-glucose reacts with conc. `HNO_(3)`.
(b) Amino acids show amphoteric behaviour. Why ?
(c ) Write one difference between `alpha`-helix and `beta`-pleated structures of proteins.

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(a) Saccharic acid is formed.
`underset("D-glucose")(CH_(2)OH(CHOH)_(4)CHO)overset(conc. HNO_(3))underset(("oxidation"))rarr underset("Saccharic acid")(HOOC(CHOH)_(4)COOH)`
(b) Amino acids have both basic `overset(..)(N)H_(2)` group and acidic COOH group. They give the characteristic reactions of both and behave as amphoteric compounds.
(c ) In `alpha`-helix structure, intramolecular H-bonding is present whereas in `beta`-pleated structure, inter molecular H-bonding is present.
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