# How does amine inversion affect basicity?

What is amine inversion, and how does it affect basicity?

For instance, why is $$\ce{Et3N}$$ less basic than (2.2.2.)cyclohexyl-amine despite the +I from ethyl groups? The answer to the question is option 3.

Compare the basic strengths of the compounds given:

1. (i) > (ii) > (iii)
2. (ii) > (i) > (iii)
3. (ii) > (iii) > (i)
4. (iii) > (ii) > (i)