Which of these molecules have non-bonding electron pairs on the cental atom?

$$\mathrm{I}: \mathrm{SF}_4 : \mathrm{II}: \mathrm{ICl}_3 : \mathrm{III}: \mathrm{SO}_2$$

Identify the correct statement describing the characteristics of $$\mathrm{C}_2$$ molecule.

In the following question, Assertion (A) is given followed by a statement of Reason (R). Choose the correct answer.

Assertion (A): $$\pi\left(2 p_x\right), \pi\left(2 p_y\right), \pi^*\left(2 p_x\right), \pi^*\left(2 p_y\right)$$ molecular orbitals have one nodal plane each.

Reason $$(\mathrm{R})$$ : All the molecular orbitals formed by the sideways overlapping have one nodal plane.

Arrange the following in the decreasing order of their Dipole moments.

a. Chlorobenzene

b. 1,2-Dichlorobenzene

c. 1,3-Dichlorobenzene

d. 1,4-Dichlorobenzene.