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Consider the amino acid given by the structural formula: HOOC - CH ₂- CH ₂- CH ( NH ₂)- COOH . Which of the following statements is correct regarding its physical and chemical properties?

Options

  1. AIt is highly soluble in non-polar solvents like benzene.
  2. BIt will have exactly two pK _ a values.
  3. CIt is a high-melting crystalline solid.
  4. DIt exists primarily as an anion in highly acidic solutions ( pH < 1 ).

Correct answer

C. It is a high-melting crystalline solid.

Step-by-step solution

The given structure is glutamic acid, an -amino acid. In the solid state and in aqueous solution, it exists as a dipolar zwitterion. Due to strong electrostatic interactions within the zwitterionic structure, it is a high-melting crystalline solid and is insoluble in non-polar solvents like benzene. The molecule has three ionizable groups (two - COOH groups and one - NH ₂ group), so it has three distinct pK _ a values. In highly acidic solutions ( pH Answer: It is a high-melting crystalline solid.

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