Which of the following represents the correct Lewis structure for the cyanate ion $(OCN^-)$?

The three-dimensional structure of $CH_4$ is given below. The bonds are labelled as $W, X, Y$ and $Z$. What are the bonds lying in the plane $(A)$,projecting out of the plane away from the observer $(B)$ and projecting out of the plane towards the observer $(C)$?

Which of the following pairs of ions are isoelectronic and isostructural?

Observe the following statements:
$i$. According to $\text{VSEPR}$ theory,$ClF_3$ and $SO_2$ are shown as $AB_3E_2$ and $AB_2E$ type molecules respectively.
$ii$. $SF_4$ has a "See-saw" shape.
$iii$. $HgCl_2$ and $PbCl_2$ have the same shape.
The statements which are not correct are:

In which of the following molecules are all bonds not equal?

$BeCl_2$ is not isostructural with