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B
2
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C
3
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D
4
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Solution
The correct option is C3 Compound A is nothing but serine. We know that serine is an acidic amino acid. It has an −OH group on the side chain. Since it is an amino acid, the functional groups −COOH and −NH2 are already present in it. Hence, there are a total of 3 functional groups present: −OH,−COOH,−NH2.