Question

The correct sequence of relationships between the compounds of pairs (i) - (iv) respectively is:

• A. Identical, enantiomers, diastereomers and structural isomers
• B. Enantiomers, identical, structural isomers and diastereomers
• C. Enantiomers, identical, diastereomers and structural isomers
• D. Identical, identical, diastereomers and structural isomers

Answer 1

The correct option is C Enantiomers, identical, diastereomers and structural isomers


(i) Enantiomers are the stereoisomers which are non-superimposable mirror images of each other. Enantiomers have opposite configurations at the respective asymmetric centre.


(ii) These molecules have the same configuration. So, they are identical.


(iii) Diastereoisomers are non-identical non-mirror images of each other having the same bonding sequence. They arise when two or more non-mirror stereisomers of a compound have different configurations at one or more (not all) of the respective stereocentres.


(iv) Structural isomers have different connectivity of atoms/species.