what is an enatiomers?

Dear Ajay,

Rotating structure ( b) 180° in the plane of the paper, the only allowable rotation, does not lead to a form that is superimposable on structure ( a). Rotations of less than or more than 180° are not allowed because in a two-dimensional projection, it is impossible to see the difference in the position of atoms that are located in front of or behind the plane.

Structures ( a) and ( b) are the only pair of enantiomers for 2-chlorobutane

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