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An amino acid reacts with 10 ml 0.05 M $$\displaystyle NaOH$$ and the final solution has $$\displaystyle pH=2.30$$. When 20 ml of the same base is added to the resulting solution, the $$\displaystyle pH$$ becomes 9.7. Identify the amino acid and calculate the isoelectric point of the amino acid. This amino acid is prepared by the reaction of compound $$(X)$$ with $$\displaystyle { NH }_{ 3 }$$, and further hydrolysis with $$\displaystyle HCN$$. Compound $$(X)$$ is less $$C$$ atom-containing compound that gives positive iodoform test and positive Fehling's solution test. An amino acid is: 


A
leucine
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B
serine
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C
glycine
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D
alanine
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Solution

The correct option is D alanine
As the given compound 'X' gives positive idoform test, therefore it should contain $$CH_3-CO-H$$ group.
Therefore amino acid is Alanine.
Isoelectric point $$(PI)= \cfrac {pk_1+ pk_2}{2}=6$$

1013798_256583_ans_40d82a7011474480923114ac29eb998c.PNG

Chemistry

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