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SolutionsCarbon Structures without end

1. Each carbon, its shape

State the geometry of each carbon:

  1. CH3–CH=CH2 (propene)
  2. HC≡C–CH3 (propyne)
  3. CH3–CO–CH3 (acetone)
  1. CH3: tetrahedral; the two double-bond carbons: trigonal planar.
  2. The two triple-bond carbons: linear; CH3: tetrahedral.
  3. The two CH3 groups: tetrahedral; the C=O carbon: trigonal planar.

2. Electron densities

How many electron densities ("balloons") surround a carbon with four single bonds, with a double bond and with a triple bond?

Four (tetrahedral), three (trigonal planar) and two (linear). A double or triple bond counts as a single electron density.

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