The hybridization of $IF_7$ is

Which reaction involves a change in the electron pair geometry for the underlined element?

What is the decreasing order of carbon-carbon single bond length in the following compounds?
$(I) CH_2 = CH - C \equiv CH$
$(II) CH \equiv C - C \equiv CH$
$(III) CH_3 - CH = CH_2$
$(IV) CH_2 = CH - CH = CH_2$

Describe the shapes of $BF_3$ and $BH_4^-$. Assign the hybridisation of boron in these species.

The hybridization of atomic orbitals of nitrogen in $NO_2^+$,$NO_3^-$,and $NH_4^+$ are:

In $HCHO$,the carbon atom has which hybridization?