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Chemistry · 2025 · 2 marks
CBSE 2025 · Region 1 · Set 2 · Q21
Give reasons for the following: (a) The melting points of α -amino acids are generally higher than that of the corresponding carboxylic acids. (b)…
Give reasons for the following :
(a)
The melting points of $\displaystyle \alpha$-amino acids are generally higher than that of the corresponding carboxylic acids.
(b)
Amino acids show amphoteric behaviour.
Marking-scheme solution
(a)
Presence of dipolar ion / Zwitter ion which create stronger electrostatic force of attraction /
structure of Zwitter ion with explanation.
(b)
Due to the presence of both carboxylic group and amino group / due to the presence of
zwitter ion structure it can react with acids and bases.
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CBSE Class 12 Chemistry past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.