1. sp3 sp sp2 What is the hybridization around C in each compound above ?
Geometries of ethane, ethene and ethyne compared
Ethane ethene ethyne (ethylene) (acetylene)
sp3 sp
sp2
What is the hybridization around C in each compound above ?

2. x y  Bond  bonds z  Bond (sp hybrid= hotdog) Unpaired p orbitals
Alkyne Bonding in pictures: the double bun hot dog picture
 Bond
 bonds
 Bond (sp hybrid= hotdog)
 Bonds (the buns) formed when unpaired p orbitals smear across space between adjacent C and overlap
Unpaired p orbitals y HC z CH x
The buns
The hot dog
Details of how electronic structure of ethyne forms

3. COMPARISION OF HYDROCARBON PROPERTIES
functional group
formula
C-C bond length
hybridization
average bond energy*
reactivity
n=2 boiling point
alkanes
CnH2n+2
15 nm
sp3
368 kJ
low
-88 oC
alkenes
CnH2n 13
sp2
305
high
-103
alkynes
CnH2n-2 12 sp
273
YIKES
-82
Alkanes + ozone  no reaction 
Alkenes + ozone  BOOM 
Alkynes + ozone  BOOM
FYI…acetylene is the second most easily detonated gas known (right after H2)

4. Alkynes get around…..
=1,3,5,7-tetranonyne found out here…