The $Cl-C-Cl$ bond angle in $1, 1, 2, 2-$tetrachloroethene and tetrachloromethane respectively are about:

In which of the following reactions is there no change in the hybridisation of the central atom?

Which of the following geometries corresponds to $sp^3d$ hybridization of the central atom?

Total number of nodal planes present in the $d-$orbital which is used in the hybridisation of $XeF_2$.

Among the triatomic molecules/ions,$BeCl_2, N_3^{-}, N_2O, NO_2^{+}, O_3, SCl_2, ICl_2^{-}, I_3^{-}$ and $XeF_2$,the total number of linear molecule$(s)$/ion$(s)$ where the hybridization of the central atom does not have contribution from the $d$-orbital$(s)$ is
[Atomic number: $S=16, Cl=17, I=53$ and $Xe=54$ ]

The hybridization in methane,ethene and ethyne respectively is