What is the structure of $CH_2 = C = CH_2$?

Identify the pair of molecules in which the central atom has the same hybridization.

In $sp$ hybridisation,the shape is:

In the following,which species does not contain $sp^3$ hybridization?

Assuming pure $2s$ and $2p$ orbitals of carbon are used in forming $CH_4$ molecule,which of the following statements is false?

$A + 2Cl^{-} \rightarrow B$
Where $A$ is $PCl_4^+$ and $B$ is $PCl_6^-$.
Which of the following statements is $INCORRECT$:
$(I)$ From $B$ to $A$,the number of $d$-orbitals involved in hybridization increases.
$(II)$ From $A$ to $B$,the percentage of $p$-character in the $P-Cl$ bond increases.
$(III)$ The number of covalent bonds in $A$ and $B$ are the same.
$(IV)$ $B$ is a product of Lewis acid-base interaction,which is associated with super-octet molecules only.