Which of the following statements are false regarding the nature of amino acids?A. The acidity and neutrality of amino acids is based on number of amino and carboxyl groups.B. Both NH2 and COOH groups of amino acids show ionizable nature.C. In solutions of different pH, the structure of amino acids does not change.D. The amino acids have amino group and aldehyde group as substituents on the same carbon.

In solutions of different pH, the structure of amino acids change. At lower pH, the amino group (-NH2) tends to be protonated, becoming NH3+. At higher pH, the carboxyl group (-COOH) tends to be ionised, losing a proton to form COO−.Amino acids have amino group and acidic group as substituents on the same carbon.

Which of the following statements are false regarding the nature of amino acids?A. The acidity and neutrality of amino acids is based on number of amino and carboxyl groups.B. Both NH2 and COOH groups of amino acids show ionizable nature.C. In solutions of different pH, the structure of amino acids does not change.D. The amino acids have amino group and aldehyde group as substituents on the same carbon.

In solutions of different pH, the structure of amino acids change. At lower pH, the amino group (-NH2) tends to be protonated, becoming NH3+. At higher pH, the carboxyl group (-COOH) tends to be ionised, losing a proton to form COO−.Amino acids have amino group and acidic group as substituents on the same carbon.

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Which of the following statements are false regarding the nature of amino acids?
A. The acidity and neutrality of amino acids is based on number of amino and carboxyl groups.
B. Both NH₂ and COOH groups of amino acids show ionizable nature.
C. In solutions of different pH, the structure of amino acids does not change.
D. The amino acids have amino group and aldehyde group as substituents on the same carbon.

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A and B only

C and D only

B and C only

A and D only

answer is B.

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Detailed Solution

In solutions of different pH, the structure of amino acids change. At lower pH, the amino group (-NH₂) tends to be protonated, becoming NH³⁺. At higher pH, the carboxyl group (-COOH) tends to be ionised, losing a proton to form COO−.
Amino acids have amino group and acidic group as substituents on the same carbon.

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