Question

Difference between Metamerism and position Isomerism .​

Answer 1

Explanation:

The main difference between position isomerism and metamerism is thatposition isomerism describes the different locations of a functional groupwhereas metamerism describes different alkyl groups attached to the samefunctional group.

Answer 2

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Answer:

Metamerism and Position isomers

Explanation:

Metamerism:

1. Metamerism is the presence of same molecular formula with dufferent alkyl groups present on either side of a functional group.
2. Metamerism belongs to the same homologous series; this means that the number of carbon atoms can be increased gradually to get different isomers. Therefore, the structures differ only in the number of CH₂ groups in the main carbon chain.
3. But alkyl groups are always attached to sides of a divalent atom like oxygen or sulfide. Or else, alkyl groups may be attached to a divalent functional group such as -NH-. Metamerism is rarely found due to these limitations. Therefore, most compounds found in metamerism are ethers and amines.

Position Isomerism:

1. Position isomerism is the presence of a similar carbon skeleton and functional groups in two or more organic compounds when the location of the functional groups is different from each other.
2. The number of carbon atoms, molecular formula, the carbon backbone structure, and the number of functional groups are same for the isomers in position isomerism. This type of isomerism is absent in compounds having end groups like carboxylic acids, aldehydes, etc. since these groups cannot be positioned in the middle of a carbon chain.
3. Let us consider an example to understand this type of isomerism. The alcoholic compounds for the chemical formula C₅H₁₂O, can be written in three main ways depending on the position of the –OH group. Here, the –OH group can be positioned in the terminal of the molecule, in the middle of the molecule or on the 2nd carbon atom from one terminal.
4. Position isomerism can be observed in alkene and alkynes as well. Here, the position of the double bond or the triple bond is different from one molecule to another. But in carboxylic acids, amides, and aldehydes, position isomerism is absent because these functional groups are essentially located only in the terminals of the molecule.