Which of the following substances is not linear?

Provide the shapes of $H_2O$,$NH_3$,and $SO_2$ including their lone pairs of electrons.

Which one of the following compounds has a bond angle of nearly $90^{\circ}$?

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 molecules can be represented as $AB_2E_2$,where $A$ is the central atom,$B$ represents bond pairs of electrons,and $E$ represents lone pairs of electrons?

In which of the following species is the central atom not surrounded by exactly $8$ valence electrons?