L3 Alkene and Alkyne Flashcards
what is alkene?
unsaturated hydrocarbon that contains at least one double bond
simplest form of alkene is what?
ethene C2H4
what is the general formula of alkene?
CnH2n
properties of alkene?
1- nonpolar
2- low boiling and melting point
3- low solubility
4- more reactive than alkanes
why alkenes are more reactive than alkanes?
because the double bond increases electron density between the two carbons
what are the 3 uses of alkenes?
ETHENE
- hormone produced by plants cases fruit to ripen and leaves to fall
- starting material for synthesis of plastic polyethylene used for plastic bags, milk jugs, ropes
- responsible for scents of lemons, lime. pine trees
what does -ene suffix mean?
that it has double bond
what does -yne suffix mean?
it has triple bond
organize alkanes, alkynes, alkenes according to their reactivity:
alkynes > alkenes > alkanes
what does alkyne mean?
unsaturated hydrocarbon that has at least one triple bond
simplest form of alkyne?
ethyne or acetylene
properties of alkynes?
1- nonpolar
2- low solubility
3- low melting and boiling point
4- more reactive than alkene
why alkyne is more reactive than alkene?
because the triple bond causes even larger electron densities than double bonds
what are the uses of alkyne?
ACETYLENE torches
1- used for metal cutting and welding
2- starting material in manufacture of plastics and other organic chemicals in the industry
how ethyne are made?
by oil refining and the reaction of calcium carbides CaC2 with water
