The structure of $CH_2Cl_2$ (dichloromethane) is:

Which of the following pairs have the same type of hybridization but different shapes?

How many of the following species have $sp^3$ hybridisation of the central atom?
$SO_3$ (Solid),$H_3PO_2$,$S_2O_3^{2-}$,$XeO_2F_2$,$I_3^-$,$N_2O$,$NH_2^-$

The shape of the ethylene molecule is

What type of overlap is involved in the formation of $C-H$ bonds in acetylene molecules?

In the acetylene molecule,the $C-H$ sigma bond is formed by the overlap of which orbitals?