In which of the following pairs,both the species have the same hybridisation?
$I$. $SF_4, XeF_4$
$II$. $I_3^-, XeF_2$
$III$. $ICl_4^+, SiCl_4$
$IV$. $ClO_3^-, PO_4^{3-}$

In which of the following molecules the central atom does not have $sp^3$ hybridization?

What is $sp^{3}$ hybridization? Give its characteristics.

What is the hybridization state of the central atom in the conjugate base of $NH_4^{+}$ ion?

What is the type of hybridization in $IF_5$?

Predict the hybridization of each carbon in the molecule of the organic compound given below. Also,indicate the total number of sigma $(\sigma)$ and pi $(\pi)$ bonds in this molecule.
$HC \equiv C-CO-CH_2-COOH$