Statement I : ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}\text{COOH}$ and 2-hydroxy propanal are not functional isomers.

Statement II : Functional isomers have same molecular formula, but different functional groups.

statement I is incorrect and statement II is correct

statement I is correct and statement II is incorrect

Both statement I and statement II are correct

Both statement I and statement II are incorrect