Question

# 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
B
serine
C
glycine
D
alanine

Solution

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

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