Which of the following statements is not correct?

The stability of the +4 oxidation state of elements of Group 14 decreases down the group

The stability of the +2 oxidation state of elements of Group 14 increases down the group

Stannous fluoride is a covalent compound

A majority of the compounds of elements of Group 14 are four covalent and involve${\mathrm{sp}}^3$ hybridization