The shape of methane molecule is

Which of the following compounds has the maximum $C-C$ single bond length?

Hybridization is due to the overlapping of

The hybridization of $IF_7$ is

The correct geometry and hybridization for $XeF_4$ are

"Hybridisation of central atom does not always change due to back bonding". This statement is valid for which of the following compounds?
$(i)$ $CCl_3^-$ $(ii)$ $CCl_2$ $(iii)$ $(SiH_3)_2O$ $(iv)$ $N(SiH_3)_3$