# My question is from a chemistry assignment Describe the structure and bonding associated with C3 of pent-2-ene? Thanks in advance!

May 30, 2018

Here's what I find.

#### Explanation:

The structure of pent-2-ene is

The important structural features are

• Carbons 1, 4, and 5 are ${\text{sp}}^{3}$ hybridized, with a tetrahedral geometry and bond angles of 120°

• There is free rotation about the $\text{C1-C2}$ and $\text{C4-C5}$ bond axes

• Carbons 2 and 3 are ${\text{sp}}^{2}$ hybridized with bond angles of 120° and a trigonal planar geometry

• Carbons 1, 2, 3, and 4 and the $\text{H}$ atoms on carbons 2 and 3 are all in the same plane

• There is no free rotation about the $\text{C2-C3}$ bond axis

• The $\text{C=C}$ double bond consists of a σ bond (${\text{sp"^2"-sp}}^{2}$ end-on overlap) and a π bond ($\text{p-p}$ sideways overlap).