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Q.

Histidine can exist following four structures depending on pH of the medium
 I)  

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II)   

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III) 

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V)  

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Which of the following option is correct description?

 

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a

pH=0pH=4 pH=8pH=12
IIIVIIII

 

b

pH=0pH=4 pH=8pH=12
IIIIIVII

 

c

pH=0pH=4 pH=8pH=12
IIIIVIII

 

d

pH=0pH=4 pH=8pH=12
IIIIIIVI

 

answer is B.

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Detailed Solution

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in highly acidic medium , it is in highly protonated condition, and in highly basic medium it is in deprotonated .

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