Which is not true for arginine?

Arginine is an amino acid. Let us check each statement:

Option 1: High melting point - TRUE (amino acids exist as zwitterions and have high melting points)

Option 2: Multiple pKa values - TRUE (arginine has 3 pKa values: α-COOH, α-NH₃⁺, and guanidinium group)

Option 3: High solubility in benzene - FALSE (amino acids are ionic/zwitterionic and are insoluble in nonpolar solvents like benzene)

Option 4: Crystalline solid - TRUE (amino acids are crystalline solids)

The statement that is NOT true is option 3: High solubility in benzene.