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Nucleophilic Substitution in Aryl Halides

At pH=4, gl...

Question

At $p H = 4$ , glycine exists as:

H_{3} \oplus N - {C H}_{2} C O ⊖ O

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H_{3} \oplus N - {C H}_{2} C O O H

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H_{2} N {C H}_{2} C O O H

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H_{2} N {C H}_{2} C O ⊖ O

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Solution

The correct option is A $H_{3} \oplus N - {C H}_{2} C O O H$
At $p H = 4$ (acidic range), glycine reacts with $H^{\oplus}$ ion as:
$H_{3} \oplus N - {C H}_{2} C O ⊖ O Z w i t t e r i o n H^{\oplus} - - \to H_{3} N^{+} - {C H}_{2} - C O O H$
Hence, option B is correct.

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Similar questions

H_{2} O + H_{3} {P O}_{4} ⇌ H_{3} O^{+} + H_{2} {P O}_{4}^{-}; p K_{1} = 2.15

H_{2} O + H_{2} {P O}_{4}^{-} ⇌ H_{3} O^{+} + H_{2} {P O}_{4}^{2 -}; p K_{2} = 7.20

0.01 M

N a H_{2} {P O}_{4}

1

M

N a H C O_{3}

H_{2} C O_{3} + H_{2} O ⇌ H C O_{3}^{-} + H_{3} O^{+};

p K_{1} = 6.38

H C O_{3}^{-} + H_{2} O ⇌ C O_{3}^{2 -} + H_{3} O^{+};

p K_{2} = 10.26

P h - C H = C H - C H O P h M g B r ⟶ H_{3} O^{+} P r o d u c t

H_{2} {P O}_{4}^{-}

H_{3} {P O}_{4} + H_{2} O \to H_{3} O^{+} + H_{2} {P O}_{4}^{-}

H_{2} {P O}_{4}^{-} + H_{2} O \to H {P O}_{4}^{2 -} + H_{3} O^{+}

H_{2} {P O}_{4}^{-} + {O H}^{-} \to H_{3} {P O}_{4} + O^{2 -}

C {\oplus H}_{3}

\oplus N H_{4}

H_{3} O^{\oplus}

{C O}_{2}

{S O}_{3}

C {⊖ H}_{3}

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