Which of the following is incorrect statement?

PbF4 is not covalent in nature. According to Fajan’s rule, ‘Pb‘ has large cations and ‘F‘ has small anion. So, PbF₄ is of ionic nature.
(1) According to Fajan’s rule, ‘Sn⁺⁴‘ has large cation and small anion which form ionic compounds. SnF₄ is of ionic nature.
(3) The vacant d-orbitals of Si can coordinate with water moleculues and, hence, SiCl₄ is hydrolysed by water.
(4) Stable oxidation state of Ge is +4.