DF9 Flashcards
What does a straight line represent (in a molecular model)?
Bond in plane of paper.
What does a dashed line represent (in a molecular model)?
Bonds going towards the paper (or behind it).
What does a wedged line represent (in a molecular model)?
Bonds towards you (away from the paper).
What is a skeletal formula?
Formula that only shows the carbon skeleton and associated functional groups of the molecule.
What is an isomer?
Two molecules that have the same molecular formula but their atoms are arranged differently.
Are isomers distinct compounds?
Yes, they have different physical and chemical properties.
How many ways can atoms be arranged differently in isomers?
Two ways - as structural isomers and stereoisomers.
What are structural isomers?
Atoms are bonded together in a different order in each isomer.
What are stereoisomers?
Order of bonding in the isomers is the same, but the atoms are arranged differently in space (in each isomer).
How many types of structural isomerisms are there?
Three
What is positive isomerism?
Occurs when the functional group is situated in different positions in the molecules.
What is functional group isomerism?
Compounds with the same molecular formula but different functional groups.
How many types of stereoisomerism are there?
Two - E/Z isomerism and optical isomerism.
What does E mean?
Opposite (trans)
What does Z mean?
Same (cis)
