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Isomer vs. Epimer — What's the Difference?

Isomer vs. Epimer — What's the Difference?

Difference Between Isomer and Epimer

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Isomer

In chemistry, isomers are molecules or polyatomic ions with identical molecular formulas — that is, same number of atoms of each element — but distinct arrangements of atoms in space. Isomerism is existence or possibility of isomers.

Epimer

In stereochemistry, an epimer is one of a pair of diastereomers. The two epimers have opposite configuration at only one stereogenic center out of at least two.

Isomer

(Chemistry) Any of two or more substances that have the same molecular formula but differ in the way their atoms are connected to each other, in the spatial orientation of their atoms, or, in the case of large molecules such as DNA, in their molecular topology.

Epimer

One of two molecules that differ in the spatial arrangement of atoms or groups surrounding only one of two or more chiral atoms in the structure.

Isomer

(Physics) Any of two or more nuclei with the same mass number and atomic number that have different radioactive properties and can exist in any of several energy states for a measurable period of time.
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Epimer

(chemistry) Any diastereoisomer that has the opposite configuration at only one of the stereogenic centres.

Isomer

(chemistry) Any of two or more compounds with the same molecular formula but with different structure.

Isomer

(physics) Any of two or more atomic nuclei with the same mass number and atomic number but with different radioactive properties. Category:en:Radioactivity

Isomer

A compound which is isomeric with another body or compound; a compound having the same chemical composition as another compound; a member of an isomeric series.

Isomer

A compound that exists in forms having different arrangements of atoms but the same molecular weight

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