Question

what is conformation of alkane?

Answer 1

Conformation of alkane. Alkane conformers arise from rotation around sp3 hybridised carbon carbon sigma bonds. The smallest alkane with such a chemical bond, ethane, exists as an infinite number of conformations with respect to rotation around the C–C bond.
In the eclipsed conformation the torsional angle is minimised.
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Answer 2

Conformation of a molecule represents the different molecular arrangement of atoms or groups caused by the free rotation around sigma bonds in the molecule. For example, free rotation around the carbon-carbon bond is responsible for numerous conformations.