Stereochem Flashcards
definition of an isomer
some molecular formula
different structural formula
definition of a structural isomer
atoms bonded together in a different order in each osimer
definition of a stereoisomer
same order of bonding atoms
different spacial arrangement
what happens for geometric isomers to occur
lack of free rotaion around C bonds
do trans isomers have a higher mp or bp than cis isomers and why
melting point
packing close
-LDF
do cis isomers have higher melting or boiling points
bioling points
more polar
-DP-DP interactions
which type of geometric isomer is more soluble in water
cis
definition of optical isomers
asymetric non superimposable images
what conditions are required for optical isomers to form
chiral carbon
why are optical isomers optically active
each isomer rotates plane polarised light by same amount in opposite directions
what are enantiomers
pair of optical isomers
what is a racemic mixture
equal proportions of both isomers
-no effect on plane polarised light as one isomer rotational effect is cancelled by the other
