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What is the difference between tautomerism and metamerism?
Tautomerism and metamerism are different types of structural isomerism.
Structural isomerism is a form of isomerism in which molecules have the same molecular formula but their atoms are connected in different orders.
Structural isomerism is divided into:
• Chain isomerism • Positional isomerism • Functional group isomerism • Tautomerism • Metamerism
Tautomerism is a dynamic equilibrium between two compounds with same molecular formula.
The most common form of tautomerism is keto-enol tautomerism.
A carbonyl compound containing at least one α-hydrogen atom is converted to an enol by the transfer of an α-hydrogen onto the oxygen atom. For example,
Metamerism is a type of structural isomerism in which different alkyl groups are attached to the same alkyl group.
For example, diethyl ether and methyl propyl ethers are metamers.
##underbrace("CH"_3"CH"_2"-O-CH"_2"CH"_3)_color(red)("diethyl ether")## and ##underbrace("CH"_3"-O-CH"_2"CH"_2"CH"_3)_color(red)("methyl propyl ether") ##
They both contain the ether functional group, but they have different alkyl groups attached to the oxygen atom.