The correct geometry and hybridization for $XeF_4$ are

Hybridisation states of $C$ in $CH_3^+$ and $CH_4$ are

Which of the underlined atoms in the molecules shown below have $sp$-hybridization?
$(u) H_2\underline{C}=CH-CH_3$
$(v) CH_2=\underline{C}=CHCl$
$(w) CH_3-\underline{C}H_2^+$
$(x) H-C \equiv C-H$
$(y) CH_3-\underline{C} \equiv N$
$(z) (CH_3)_2C=\underline{N}-NH_2$

Explain the hybridization of carbon and the bond structure in the ethyne $(C_2H_2)$ molecule.

Explain the formation of four sigma bonds by $sp^3$ hybrid orbitals with an example.

In which of the following pairs do both the species have $sp^{3}$ hybridization?