Structural isomers have different covalent linkage of atoms.Steroisomers are compounds that have same sequence of covalent bonds but differ in the relative positions of their atoms in space.Geometrical and optical isomers are the two important types of configurational isomers. The compound with double bonds or ring structure have restricated rotation.so exist in two geometrical forms.The double bonds in the larger rings (ring size 10 carbon or large) can also cause geometrical isomerism. The optical isomers rotate the plane of plane-polarised light.A sp^3-hybridised carbon atom bearing four different types of substituents is called an asymmetric centre or chiral centre.A chiral object or molecule cannot be superimposed on its mirror image.Stereoisomers that are mirror images of each other are called enantiomers.The stereoisomers that are not mirror images of each other are called diastereomers.Diastereomers have different physical properties. A racemic mixture is optically inactive and contains equal amount of both the enantiomers.Resolution refers to method of separating a racemic mixture into two pure enantiomers.A meso compound is an optically inactive stereoisomers, which is achiral due to the presence of an internal plane of symmetry within the molecule. Observe the following reaction Which statement is not correct about the above observation.