In the following three-dimensional structure of $CH_4$,the bonds are labelled as $W, X, Y$ and $Z$. The bonds projecting out of the plane are:

Consider the species $CH_4$,$NH_4^+$ and $BH_4^-$. Choose the correct option with respect to these species.

Which molecule is linear?

Which of the following pairs of species have an identical shape?

Identify the molecule $(X)$ with the maximum number of lone pairs of electrons (obtained using Lewis dot structure) among $HNO_{3}$,$H_{2}SO_{4}$,$NF_{3}$,and $O_{3}$. Choose the correct bond angle made by the central atom of the molecule $(X)$. (in $^{\circ}$)

Which among the following species has unequal bond lengths?