Isomerism

what does structural isomer mean?

compounds with the same molecular formula but a different structural formula

what does stereoisomerism mean?

the same structural formula but a different arrangement of atoms in space

what does stereoisomerism need?

a C=C bond restricting movement, the C to have different groups attached to it

what is E isomerism?

where the not H groups are on the same side, making and almost E shape

what is Z isomerism?

where the not H groups are on the opposite side, making and almost Z shape

what does cis/trans isomerism need?

a C=C bond, different groups attached to the C, the attached group on each carbon of the C=C must be the same

what is cis isomerism?

where the same attached groups are on the same side like E

what is trans isomerism?

where the same attached groups are on the opposite side like Z