As the $p-$character increases,the bond angle in hybrid orbitals formed by $s$ and $p$ atomic orbitals

Methane is tetrahedral but not square planar in nature,prove it.

Fill in the blanks:
$(i)$ Based on the type of overlapping,covalent bonds are classified into ........ and .......... .
$(ii)$ The bond formation involving hybrid orbitals is called ............. .
$(iii)$ The type of hybridization observed in the $C_2H_6$ molecule is ........... .
$(iv)$ The type of hybridization observed in the $BrF_5$ complex is ............... .

Which one of the following is a correct set with respect to molecule,hybridisation,and shape?

Identify the molecule in which the central atom undergoes $sp^3$ hybridisation.

Select the molecule in which all the atoms may lie on a single plane.