Carbon suboxide $C_3O_2$ has

Which of the following compounds have the same number of lone pairs on their central atom?
$I. XeF_5^- \quad II. BrF_3 \quad III. XeF_2 \quad IV. H_3S^{+} \quad V. CH_2$ (Methylene)

Match the List-$I$ with List-$II$.

List-$I$ Molecule/ion	List-$II$ Bond pair : lone pair (on the central atom)
$A. ICl_2^-$	$I. 4 : 2$
$B. H_2O$	$II. 4 : 1$
$C. SO_2$	$III. 2 : 3$
$D. XeF_4$	$IV. 2 : 2$

Choose the correct answer from the options given below:

Which of the following orders cannot be explained by back bonding?

Amongst $ClF_3$,$BF_3$ and $NH_3$ molecules,the one with non-planar geometry is:

Which of the following is the correct order of increasing number of lone pair of electrons on the central atom?