alkenes & their reactions Flashcards
general formula
CnH2n
why are alkene molecules unsaturated?
they contain two fewer hydrogen atoms than the alkane with the same number of carbon
atoms
first four alkenes
ethene-C2H4
propene-C3H6
butene-C4H8
pentene-C5H10
what is the functional group of alkenes?
C=C
what determines the reactions of organic compounds?
the generality of reactions of functional groups
how do alkenes react with oxygen?
in combustion reactions in the same way as other hydrocarbons, but they tend to burn in air with smoky
flames because of incomplete combustion
how do alkenes react with halogen, hydrogen and oxygen?
by the addition of atoms across the carbon-carbon double bond so that the double bond becomes a single carbon-carbon bond
general equation hydrogen
alkene + hydrogen —> alkane
general equation water
alkene + water —> alcohol
general equation halogen
alkene + halogen —-> halogenalkane
isomers
same molecular formula but different display formula
C2H4Br2 name
dibromoethene