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18 Cards in this Set

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A Stereoisomers;Same connectivity but differ by relative bond configuration. (Enantiomer/Diastereomer)


Configurational isomer; Mirror image but not superimposable


Configurational isomer; Not mirror images; same formula, same connectivity but different molecules; cis or trans


Chiral or Achiral


Molecule with an enantiomer (non-superimposable mirror image)


Molecule without an enantiomer

Plane of symmetry chirality test

Chiral - w/o plane of symmetry on hexane

Achiral - w/ a plane of symmetry on hexane


Atom where interchanging any 2 of its groups results in a different stereoisomer

Tetrahedral Stereocentre

cental atom bonded to 4 different groups

Meso isomers

Molecules with at least 2 stereocentres but contains a plane of symmetry and therefore is overall achiral

Enantiomer vs Diastereomer

Enantiomers - related by inversion of all stereocenters

Diastereomers - related by inversion of some and not all stereocentres

Maximum number of configurational isomers

2^n config isomers, with n number of stereocentres

Constitutional Isomers

differ by connectivity (bond multiplicity, ring/chain)

Enantiomer properties

similar depending on environment

Chiral Environment

other chiral species must have at least one different physical/chemical property

Achiral Environment

No other chiral species or other chiral species with the very same physical/chemical properties

Diasteromer properties

with different physical/chemical properties

Double bond stability

the more alkyl substituted, the more stable a double bond