Statement I: Amino acids are substituted methanes as there are four substituent groups occupying the four valency positions.
Statement II: The four valency positions of carbon are substituted by hydrogen, carboxyl group, amino group and a variable group designated as R group.

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Statement I and statement II are correct

Statement I and statement II are incorrect

Statement I is incorrect but statement II is correct

Statement I is correct but statement II is incorrect

answer is D.

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Detailed Solution

Amino acids are organic compounds containing an amino group and an acidic group as substituents on the same carbon i.e., the α-carbon. Hence, they are called α-amino acids. They are substituted methanes. There are four substituent groups occupying the four valency positions. These are hydrogen, carboxyl group, amino group and a variable group designated as R group.

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