Question 8.5: Identifying hybridization and Orbital Overlap in Single and ...

Identifying Hybridization and Orbital Overlap in Single and Double Bonds
Describe the hybridization of the carbon atoms in allene, $H_{2}C= C= CH_{2}$ , and make a rough sketch of the molecule showing orbital overlap in bond formation.

STRATEGY

Draw an electron-dot structure to find the number of charge clouds on each atom.

Then predict the geometry around each atom using the VSEPR model (Table 8.1)

TABLE 8.1 Geometry Around Atoms with 2, 3, 4, 5, and 6 Charge Clouds
Number of Bonds	Number of Lone Pairs	Number of Charge Clouds	Molecular Shape (Geometry)	Example
2	0	2
$\begin{bmatrix} 3 \\ 2 \end{bmatrix}$	$\begin{bmatrix} 0 \\ 1 \end{bmatrix}$	3
$\begin{bmatrix} 4\\ 3 \\2 \end{bmatrix}$	$\begin{bmatrix} 0\\ 1 \\2 \end{bmatrix}$	4
$\begin{bmatrix} 5 \\ 4 \\3\\2 \end{bmatrix}$	$\begin{bmatrix} 0 \\ 1\\2\\3 \end{bmatrix}$	5
$\begin{bmatrix} 6 \\ 5\\4 \end{bmatrix}$	$\begin{bmatrix} 0 \\ 1\\2 \end{bmatrix}$	6

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