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Conformers

Definition

Two molecules are conformers if 1) they are not superimposable 2) they can be rendered superimposable by rotation of parts of their molecules around simple C-C bonds.

Animation

Two conformer molecules

 

Click on the right image to make the group CH2Cl turn alone around the axis C-C

Examples

Same substance or no?

As thermal agitation causes always easy rotations around single bonds, it is not possible to separate conformers molecules at normal temperature:

Conformers molecules belong to the same chemical substance.