MCQ
For $\alpha - $amino acids having the structure$R - \mathop {\mathop {CH - }\limits_{|\,\,\,\,\,\,\,\,\,} }\limits_{N{H_2}\,\,} C{O_2}H$ Which of the following statements are true

(a) Water solubility is maximum at a $pH$ when concentrations of anions and cations are equal

(b) They give ninhydrin test

(c) On reacting with nitrous acid give off ${N_2}$

  • A
    All
  • $B$ and $C$
  • C
    $A$ and $B$
  • D
    $A$

Answer

Correct option: B.
$B$ and $C$
b
Due to the presence of free - $NH _{-}{ }^2$ group given amino give The Ninhydrin Test. on reaction with the Nitrous acid diazo ester is formed and give off $N _2$ from the diazoniumion.

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