The geometry and the type of hybrid orbital present about the central atom in $BF_3$ is

During the conversion of $PCl_3$ to $PCl_5$,the hybridisation of the $P$ atom changes from .......

Which of the following molecules has a central atom with $sp^2$ hybridization?

The hybridisation of $C$ in diamond,graphite and ethyne is in the order

What are the shapes of ethyne and methane?

Which is the correct statement?
As the $s$-character of a hybrid orbital decreases:
$(I)$ The bond angle decreases
$(II)$ The bond strength increases
$(III)$ The bond length increases
$(IV)$ Size of orbitals increases