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'Stereoisomers' printed from https://nrich.maths.org/
First pair: cannot be superimposed on its partner.
Second pair: cannot be superimposed on its partner.
Third pair: can be superimposed on its partner.
From the second set of molecules:
First pair: enantiomers and therefore also stereoisomers
Second pair: these are the same molecule!
Third pair: not stereoisomers.
Fourth pair: enantiomers and therefore also stereoisomers.
Third set of molecules:
First molecule:S
Second molecule: S
For molecules based around a central carbon atom, for enantiomers
to be possible, all the four substituents on the carbon atom must
be different.