What atomic or hybrid orbitals make up the sigma bond between C2 and Cl in dichloroethylene, CH2CCl2? (C2 is the second carbon in the structure as written.)

orbital on C2?

orbital on Cl?

What is the approximate C1-C2-Cl bond angle?

Answer is:

1) orbital on C2 is sp2 hybrid orbitals and orbital on Cl is p atomic orbital.

Carbon atom is sp2 hybridized, it has three sp2 orbitals and one p orbital, they form four bonds. Three sp2 orbitals form three sigma bonds. Pi bonds are formed between two p orbitals on C1 and C2 atoms.

In sp2 hybridization the 2s orbital mixes with only two of the three available 2p orbitals.

2) the approximate C1-C2-Cl bond angle is 120°.