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Structure of ...

Question

Structure of alanine at $p H = 2$ and $p H = 10$ are respectively:

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both

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Solution

The correct option is A

Alanine exists as zwitter ion at physiological pH. At lower pH (acidic medium), it accepts a proton and exists as cation. At high pH (basic medium), it donates a proton and exists an anion

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6

6.0

C O O H

5.0 \times 10^{- 3}

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H_{3} N^{+} C H ({C H}_{3}) {C O}_{2} H

H_{2} N C H ({C H}_{3}) {C O}_{2}^{-}

H_{3} N^{+} C H ({C H}_{3}) {C O}_{2}^{-}

H_{2} N C H ({C H}_{3}) {C O}_{2} H

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