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Chemistry · 2023 · 3 marks
CBSE 2023 · Region 5 · Set 1 · Q29
Give reasons for any 3 of the following observations: (a) Penta-acetate of glucose does not react with hydroxylamine. (b) Amino acids behave like…
Give reasons for any $\displaystyle 3$ of the following observations :
(a)
Penta-acetate of glucose does not react with hydroxylamine.
(b)
Amino acids behave like salts.
(c)
Water soluble vitamins must be taken regularly in diet.
(d)
The two strands in DNA are complimentary to each other.
Marking-scheme solution
(a) Absence of free - CHO group.
(b) Due to the presence of both acidic (-COOH) and basic \(\displaystyle \left(-\mathrm{NH}_{2}\right)\) groups in the same molecule / formation of Zwitter ion.
(c) They are excreted in urine / cannot be stored in body.
(d) Because the H-bonds are formed between specific pairs of bases / pairing between A & T and between C & G.
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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.