Which of the following statements are correct.

i) NaCl is more ionic than KCl

ii) ${\text{ZnCl}}_{\text{2}}$  is less ionic than ${\text{CaCl}}_{\text{2}}$

iii) ${\text{CaF}}_{\text{2}}$ is an ionic compound where as ${\text{CaI}}_{\text{2}}$ is a covalent compound.