Allenes have both similar and different structural properties compared to alkynes. Look up the
three-dimensional orbital diagram for both an alkyne and an allene. Then, redraw each structure
below showing the hybrid atomic orbitals clearly. Label the specific hybrid orbitals that overlap
to make the sigma-bonds and also label each of the p-orbitals clearly. It will be helpful to first
know what the hybridization of each carbon atom is when doing this so that you know what atomic
orbitals (hybridized and unhybridized) are available to hold the bonding and non-bonding
electrons. In your drawing, be sure to clearly illustrate the plane each of the pi-bonds are oriented
about and explain why different planes are required for each of the pi-bonds, respectively.
Allenes have both similar and different structural properties compared to alkynes. Look up the
three-dimensional orbital diagram for both an alkyne and an allene. Then, redraw each structure
below showing the hybrid atomic orbitals clearly. Label the specific hybrid orbitals that overlap
to make the sigma-bonds and also label each of the p-orbitals clearly. It will be helpful to first
know what the hybridization of each carbon atom is when doing this so that you know what atomic
orbitals (hybridized and unhybridized) are available to hold the bonding and non-bonding
electrons. In your drawing, be sure to clearly illustrate the plane each of the pi-bonds are oriented
about and explain why different planes are required for each of the pi-bonds, respectively.
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