1. A Review of General Chemistry

What is the hybridization of the carbon atoms in $C_2{H}_2{\mathrm{Cl}}_2$ (1,2-dichloroethene)?

Which type of hybridization is responsible for preventing successful interbreeding among members of different species due to hybrid breakdown?

In the context of molecular hybridization, what is the hybridization state of carbon in methane (${\mathrm{CH}}_4$)?

Which of the following atoms in histrionicotoxin 283a are ${\mathrm{sp}}^2$-hybridized?

Given the molecule $C_2{H}_4$ (ethene), what is the hybridization at each of the carbon atoms?