What is the hybridization of the iodine atom in $ICl_2^-$?

In the series ethane,ethylene and acetylene,the $C-H$ bond energy is

The hybridization of $Se$ in $SeF_4$ and its geometry respectively are

Which among the following molecules have $sp^3d$ hybridisation with one lone pair of electrons on the central atom?
$(i)\ SF_4$
$(ii)\ [PCl_4]^+$
$(iii)\ XeO_2F_2$
$(iv)\ ClOF_3$

What is meant by hybridisation? The compound $CH_2 = C = CH_2$ contains $sp$ and $sp^2$ hybridised carbon atoms. Will it be a planar molecule?

Which of the following is an incorrect relation based on Bent's rule?