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Chemistry · 2023 · 3 marks
CBSE 2023 · Region 1 · Set 3 · Q30
(a) Write the product when D-glucose reacts with conc. HNO_3. (b) Amino acids show amphoteric behaviour. Why? (c) Write one difference between α…
(a)
Write the product when D-glucose reacts with conc. $\displaystyle \mathrm{HNO}_{3}$.
(b)
Amino acids show amphoteric behaviour. Why?
(c)
Write one difference between $\displaystyle \alpha$-helix and $\displaystyle \beta$-pleated structure of protein.
Marking-scheme solution
(a) Saccharic acid / HOOC- \(\displaystyle (\mathrm{CHOH})_{4}-\mathrm{COOH}\)
(b) Due to the presence of - COOH and \(\displaystyle -\mathrm{NH}_{2}\) group / Due to the formation of Zwitter ion.
(c) \(\displaystyle \alpha\)-helix has intramolecular H-bonding and \(\displaystyle \beta\)-helix has intermolecular H-bonding.
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CBSE Class 12 Chemistry past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.