These are position isomers as the function hroup are attached todifferent carbon atom in carbon. they are not metamre because the number of C atom on either side of -S–are same: $\text{CH}_3-\text{S}-\text{CH}_2-\text{CH}_2-\text{CH}_3$ Methyl n-propyl thioether. Methyl isopropyl thioether.
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