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Question

For α - amino acid having the structure,
RCH|NH2CO2H

Which of the following statements are true?
(A) Water solubility is maximum at a pH when the concentration of anions and cations are equal.
(B) They give ninhydrin test.
(C) On reacting with nitrous acid, they give of N2.

A
All
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B
B and C
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C
A and B
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D
None of these
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Solution

The correct option is B B and C
At isoelectric point, amino acids has minimum solubility in water.
Amino acids or α-amino acids give ninhydrin test.
With HNO2, α-amino acids gives hydroxyacids and N2 gas.
R NH2|CHCOOHHNO2−−−R C|HOHCOOH+N2

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