posted by Carter .
does chlorine or carbon have greater ionization energy?
I would expect it to be harder to pull an electron away from 17 + charges on chlorine than 6+ charges on carbon; although the outer electron is farther away in Cl. You can look these things up in a table; I did and Cl has a higher IP than C but not by all that much.
Carbon has much less ionization energy, as Ionization energy is defined.