$A$ $sp^3$ hybridized orbital contains

Which of the following statements is $NOT$ correct?

$A + 2Cl^{-} \rightarrow B$
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.

The state of hybridisation of the central atom in the dimer of $BH_3$ and $BeH_2$ is

Which of the following will be octahedral?

In allene $(C_3H_4)$,the type$(s)$ of hybridisation of the carbon atoms is (are):