The Molecule:

The formula CH2CCHCH3 represents a butene molecule (specifically 1-butene). Here's how it looks:

```

H

|

H - C = C - C - H

| | |

H H CH3

1 2 3 4

```

Carbon 3

* Hybridization: Carbon 3 is connected to three other atoms (two hydrogens and one carbon). This means it has three electron domains, making it sp2 hybridized.

* Molecular Geometry: sp2 hybridization results in a trigonal planar geometry around carbon 3. This means the three atoms connected to carbon 3 lie in a plane, with bond angles of approximately 120 degrees.

Bond Angles

* Carbon 2: This carbon is also sp2 hybridized due to the double bond, resulting in a trigonal planar geometry with bond angles of approximately 120 degrees.

* Carbon 4: This carbon is sp3 hybridized (four single bonds), resulting in a tetrahedral geometry with bond angles of approximately 109.5 degrees.

In summary:

* Carbon 3: sp2 hybridization, trigonal planar geometry, bond angles ~120 degrees

* Carbon 2: sp2 hybridization, trigonal planar geometry, bond angles ~120 degrees

* Carbon 4: sp3 hybridization, tetrahedral geometry, bond angles ~109.5 degrees