Which of the following does not have a lone pair on the central atom?

Amongst the following,the number of species having a linear shape is $...........$
$XeF_2, I_3^{+}, C_3O_2, I_3^{-}, CO_2, SO_2, BeCl_2$ and $BCl_2^{\Theta}$

Which of the following molecules possesses a three-fold axis of symmetry?

Describe the geometry (shape) of some simple molecules or ions with central atoms having one or more lone pairs of electrons $(E)$.

The sets of molecules in which the central atom has no lone pair of electrons are:
$i$. $SnCl_2, NH_3, SF_4$
$ii$. $HgCl_2, SO_3, SF_6$
$iii$. $BeCl_2, BF_3, PCl_5$
$iv$. $ClF_3, BrF_5, XeF_6$

Given below are two statements:
Statement $I:$ $SO_2$ and $H_2O$ both possess $V$-shaped structure.
Statement $II:$ The bond angle of $SO_2$ is less than that of $H_2O$.
In the light of the above statements,choose the most appropriate answer from the options given below: