Isomerism that occurs due to different alkyl chains on either side of the functional group in the molecule is:
Chain isomerism
Geometrical isomerism
Position isomerism
Metamerism
Isomerism that occurs due to different alkyl chains on either side of the functional group in the molecule is metamerism
Positional isomerism, an example of structural isomerism, occurs when functional groups are in different positions on the same carbon chain.