The document discusses the conformational changes that occur in molecules. It notes that: 1) Conformations involve the rotation of bonds around single bonds, with staggered and eclipsed conformations having different energies. 2) Staggered conformations are more stable than eclipsed conformations due to interactions between hydrogen and chlorine atoms. 3) Increasing the number of chlorine substituents on an alkane increases the energy difference between staggered and eclipsed conformations.

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