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Amino acids behave like salts rather tha...

Amino acids behave like salts rather than simple amines or carboxylic acids. This behavior is due to the presence of both acidic (COOH) and basic `(-NH_(2))` group in the same molecule. In aqueous solution, the carboxyl group can lose a proton and amino group can accept a proton, giving rise to a dipolar lon known as Zwitter ion.
Zwitter ion exists.

A

at pH = 7

B

in acidic medium

C

in basic medium

D

at a specific pH

Text Solution

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The correct Answer is:
D
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Knowledge Check

  • Refer to the given graph showing state of ionisation of zwitterion. Select the correct statements regarding zwitterion. (i) Zwitterions can be formed from compunds that contain both acid groups and basic groups in their molecules. (ii) A zwitterion can act either as proton donor or proton acceptor. (iii) A monoamine monocarboxylic alpha -amino acid is a acid at high pH as both the groups (amino and carboxyl) lose a proton. (iv) Amino acids in solution at neutral pH exist predominantly as dipolar ions, the amino group is protonated (-NH_(3)^(+)) and the carboxyl group is deprotonated (-COO^(-)) .

    A
    (iii) and (iv)
    B
    (i), (ii), (iii) and (iv)
    C
    (i) and (ii)
    D
    (i), (ii) and (iii)

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