Octahedral molecular shape exists in .......... hybridisation.

The state of hybridization of the central atom in the dimers of $BH_3$ and $BeH_2$ is:

Consider the following reactions:
$(i)$ $PCl_3 + 3H_2O \to H_3PO_3 + 3HCl$
$(ii)$ $SF_4 + 3H_2O \to H_2SO_3 + 4HF$
$(iii)$ $BCl_3 + 3H_2O \to H_3BO_3 + 3HCl$
$(iv)$ $XeF_6 + 3H_2O \to XeO_3 + 6HF$
Then according to given information the incorrect statement is

The correct order of hybridisations of the central atom in $NH_3$,$[PtCl_4]^{2-}$,$PCl_5$,and $BCl_3$ is:

The correct order regarding electronegativity of hybrid orbitals of carbon is

In $HCHO$,the carbon atom has which hybridization?