Which of the following molecules is linear?

What is the type of hybridization in $IF_5$?

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

Which of the following molecules contains $50 \%$ $p$-character in the hybrid orbitals of the $C$ atom?

The hybridization states of the central atoms of the ions $I_3^-$,$ICl_4^-$ and $ICl_2^-$ are respectively

Which hybrid orbitals are used by carbon atom in the following molecules?
$(a)$ $CH_3-CH_3$
$(b)$ $CH_3-CH=CH_2$
$(c)$ $CH_3-CH_2-OH$
$(d)$ $CH_3-CHO$
$(e)$ $CH_3COOH$