IIT JEE , AIEEE Forum - Chemistry , Organic Chemistry - diff. b/w metamers and position isomers ?

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Position Isomers:
The Compounds having same molecular formula but different
positions of Double Bond,Triple Bond or Functional Group are
"Position Isomers" of each other.

Eg:
(1)CH₃-CH₂-CH=CH₂ (1-Butene)
   CH₃-CH=CH-CH₃ (2-Butene)

(2)CH₃-CH₂-CH₂-OH (Propanol-1)
   CH₃ - CH - CH₃   (Propanol-2)
            l
   OH

Metamerism:
Compounds having same molecular formula but different no.
of Carbon atoms(Alkyl Group) on either side of functional
group are called as "Metamers".

Usually metamerism is observed in Ether,Ketones,ester,2⁰
and 3⁰ amines where alkyl groups are attached to same
functional group.

Eg:
(1)CH₃-CH₂-OCH₂-CH₃ (Ethoxy ethane)
   CH₃-O-CH₂-CH₂-CH₃ (1-methoxypropane)
   CH₃-O-CH-CH₃        (2-methoxypropane)
              l
            CH₃

And Metamers may also be Position isomers.
For example: "pentanone-2" and "pentanone-3" are both
               position isomers and metamers.

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