COMEDK2025ChemistryBiomoleculesActual
Which statement is incorrect about aminoacids?
Options
- A-aminoacids are soluble in polar solvents like petroleum ether and benzene.
- BMethionine is an essential aminoacid.
- CAll aminoacids except glycine are optically active.
- DAt isoelectric point, an aminoacid has the least solubility in water.
Correct answer
A. -aminoacids are soluble in polar solvents like petroleum ether and benzene.
Step-by-step solution
Amino acids are polar compounds due to the presence of both amino and carboxyl groups, which exist as zwitterions in aqueous solutions. Because of their ionic nature, they are highly soluble in water but are insoluble in non-polar organic solvents like petroleum ether and benzene. Methionine is indeed an essential amino acid, meaning it cannot be synthesized by the human body and must be obtained through diet. Glycine is the simplest amino acid with the structure NH₂-CH₂-COOH . Since the -carbon is attached to two