alkenes gaps Flashcards
What does cracking do?
reform polymers.
Formation of Pi bond???
P orbitols overlapp sideways above and below carbon atoms.
priorities : double bond or halogen
double bond
Priorities: halogens or alkyl
halogens
Priorities: halogen or alcohol
alcohol
Priorities: double bond or alcohol
alcohol
A polymer that breaks down…
biodegradable polymer
when is Cahn- ingold- Prelog nomenclature used
to classify alkenes when stereoisomers are present but cis trans classification is not possible.
Cahn- ingold- Prelog rules
The highest atomic number on each side immediately attatched to the carbon atoms in the double bond.
What makes alkenes more reactive?
Pi bond is much weaker than the sigma bond
vegetable oil to margerine and why?
buble hydrogen gas, nickel catalyst.
lots of double bonds.
Oils now saturated.
hydrogenated products have a higher melting point.
Margarine: a slippery controversy
the hydrogenating process can lead to the formation of trans fats.
Testing for alkenes
electrophilic addition of Br2 in the form of bromine water. forms a bromoalkane. colour change from orange to colourless.
use for poly tetrafloroethene
its teflon. do the maths
use for polythenolethene
its polystyrene. do the maths.
