COMEDK · Chemistry · 30. Biomolecules

Which statement is incorrect about aminoacids?

A \(\alpha\)-aminoacids are soluble in polar solvents like petroleum ether and benzene.
B Methionine is an essential aminoacid.
C All aminoacids except glycine are optically active.
D At isoelectric point, an aminoacid has the least solubility in water.

Verified Solution

Answer & Solution

Correct Answer

(A) \(\alpha\)-aminoacids are soluble in polar solvents like petroleum ether and benzene.

Step-by-step Solution

Detailed explanation

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…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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