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70 STEREOCHEMISTRY: CHIRAL MOLECULES
STUDY AID
An Approach to the Classification of Isomers
Do the compounds have the
same molecular formula?
Are they different?
Yes
They are not isomers.
No
Yes No
We can classify isomers by asking and answering a series of questions:
They are isomers. They are identical.
Do they differ in connectivity?
Are they mirror images
of each other?
Yes No
They are constitutional
isomers.
They are stereoisomers.
Yes No
They are enantiomers. They are diastereomers.
5.20 (a) It would be optically active.
(b) It would be optically active.
(c) No, because it is a meso compound.
(d) No, because it would be a racemic form.
5.21 (a) Represents A
(b) Represents C
(c) Represents B