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Question

At pH=4, glycine exists as:

A
H3NCH2COO
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B
H3NCH2COOH
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C
H2NCH2COOH
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D
H2NCH2COO
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Solution

The correct option is A H3NCH2COOH
At pH=4 (acidic range), glycine reacts with H ion as:
H3NCH2COOZwitterionHH3N+CH2COOH
Hence, option B is correct.

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