[adianadiadi (OP)]

What is the name of isomerism exhibited by methyl acetate and ethyl formate. Both are esters. So not functional isomers.

Do you call them metamers or something else?

[RD]

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I'd go for "position isomerism" ( but wait for Bored Chemist's opininon ) ...

Structural isomers have different IUPAC names and may or may not belong to the same functional group

http://en.wikipedia.org/wiki/Isomer#Structural_isomers

[adianadiadi (OP)]

Ok! I got it now. It is a case of metamerism.

[RD]

"Metamer" is an obsolete term for isomer ...

Metamerism
From Wikipedia, the free encyclopedia ...

   The chemical property of having the same proportion of atomic components in different arrangements
 (obsolete, replaced with isomer)

http://en.wikipedia.org/wiki/Metamerism

[adianadiadi (OP)]

Yes! I too think naming isomerism is some times difficult.