A six-membered ring with 6 tetrahedra naturally assumes a chair conformation as the conformation of lowest energy, which minimizes trans-annular interactions. Knowing this is no substitute for getting a set of models and having a play with them. Now, not only do you have to be able to recognize the conformations, you also have to able to translate that 3D geometry onto the 2D printed page. This is certainly non-trivial.
Chair conformation: A six-membered ring conformation in which atoms 2, 3, 5, and 6 lie in the same plane, atom 1 lies above the plane, and atom 4 lies below the plane.
conformational isomerism is a form of stereoisomerism in which the isomers can be interconverted just by rotations about formally single bonds (refer to figure on single bond rotation).
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