For alpha-amino acids having the structure R- | vedclass

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(B) The $pH$ at which the concentration of anions and cations is equal is the isoelectric point $(pI)$. At this $pH$,the amino acid exists as a zwitte

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$B$ and $C$

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(B) The $pH$ at which the concentration of anions and cations is equal is the isoelectric point $(pI)$. At this $pH$,the amino acid exists as a zwitterion,which has the minimum solubility in water,not maximum.$(b)$ All $\alpha$-amino acids react with ninhydrin to produce a characteristic purple-blue colored complex.$(c)$ $\alpha$-amino acids react with nitrous acid $(HNO_2)$ to form a diazonium salt,which is unstable and decomposes to release $N_2$ gas.Therefore,statements $(b)$ and $(c)$ are true.

For $\alpha$-amino acids having the structure $R-CH(NH_2)-CO_2H$,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,they give off $N_2$.

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For $\alpha$-amino acids having the structure $R-CH(NH_2)-CO_2H$,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,they give off $N_2$.