What type of bond cleavage occurs in ionic reactions of organic compounds?

Among the following, the compound(s) containing no covalent bonds is/are:
KCl, PH₃, O₂, B₂H₆, H₂SO₄

1. KCl, B₂H₆, PH₃

2. KCl, H₂SO₄

3. KCl

4. KCl, B₂H₆

The correct statement for the molecule CsI₃ is:

1. It contains Cs⁺ and $I_3^{-}$ ions.
2. It contains Cs³⁺ and I^– ions.
3. It contains Cs⁺, I^– and lattice I₂ molecule.
4. It is a covalent molecule.