Actually both A and B show metamerism imo. Also, I would have marked A actually.
Also, if we follow this priority order, A should be considered metamer before positional isomer
Is this given in any standard book cuz I haven't heard such type for priority of isomers ..
Heard this first time
I also googled this but couldn't find any related material
Even I saw it for the first time when @shiv12 posted it. It seems to work for the question in that thread so I guess it's valid?
@shiv12 might have more details.
This is given by our sir , and also worked for some questions. So didn't required to verify.
Though I will try it.