Linear structure is assumed by :
$(I)$ $NCO^{-}$ $(II)$ $CS_2$ $(III)$ $NO_2^+$ $(IV)$ Solid $BeH_2$

Which molecule is linear?

What is the shape of $AB_4E$ type of molecule according to $\text{VSEPR}$ theory?

The $H-N-H$ bond angle in $NH_{3}$ molecule is

Given below are two statements:
Statement $(I) :$ For $ClF_3$,all three possible structures may be drawn as follows:
(Image provided)
Statement $(II) :$ Structure $III$ is most stable,as the orbitals having the lone pairs are axial,where the $\ell p-bp$ repulsion is minimum.
In the light of the above statements,choose the most appropriate answer from the options given below:

Which of the following compounds has a central atom with one lone pair of electrons and three bond pairs of electrons?