Answer 1

The ethers with the same molecular formula but different alkyl groups attached on either side of the oxygen atom are called metamers of each other, and the phenomenon is called metamerism

Answer 2

Metamerism (positional isomerism): Ethers having same molecular formula but different alkyl groups attached on either side of the oxygen atom are called metamers of each other. This phenomenon is called metamerism (positional isomerism).