Questions and Answers
How many sigma and pi bonds are present in a molecule of cumulene (H2C=C=C=C=H)?
7 sigma bonds, 3 pi bonds
What types of orbital overlap occur in cumulene? (Select all that apply)
In cumulene, what are the C=C=C and H−C−H bond angles, respectively?
180 degrees for C=C=C bonds, 120 degrees for H−C−H bonds
What is the predicted shape, bond angle, and hybridization for +CH3?
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Study Notes
Cumulene Overview
- Cumulene has the molecular formula H2C=C=C=C=H2.
- Contains a total of 7 sigma bonds and 3 pi bonds.
Orbital Overlap in Cumulene
- Various types of orbital overlaps occur:
- s/s overlap
- s/sp² overlap
- sp/sp² overlap
- sp/sp overlap
- p/p overlap
- sp²/sp² overlap
- Primary overlaps include: s/sp², sp/sp², sp/sp, and p/p.
Bond Angles in Cumulene
- The bond angle for C=C=C is 180 degrees, indicating a linear arrangement.
- The H−C−H bond angle is 120 degrees, corresponding to a trigonal planar geometry around the carbon atoms.
Hybridization and Molecular Geometry
- For the +CH3 group:
- Predicted shape is trigonal planar.
- Bond angle is 120 degrees.
- Hybridization state is sp².
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Test your knowledge on the molecular structure of cumulene with these flashcards. Explore sigma and pi bonds, types of orbital overlap, and bond angles in this unique molecule. Perfect for pre-class revision in organic chemistry.
