What is true about the change: ${\mathrm{SO}}_2+\frac{1}{2}{\mathrm{O}}_2\to {\mathrm{SO}}_3$?

(i) Hybrid state of sulfur changes from $\mathrm{sp}$ to ${\mathrm{sp}}^2$.

(ii) The bent shape of ${\mathrm{SO}}_2$ changes to trigonal planar.

(iii) Bond angles between$\mathrm{O}-\mathrm{S}-\mathrm{O}$ atoms are different.

There are three diatomic species with each having a bond order of three. What is true regarding them?

(a) All of them can be isoelectronic.

(b) They are isostructural.

(c) They may include cationic/anionic species.

(d) They may include neutral species.

In which of the following compounds, all the carbon atoms are in the same hybridized state?

$\mathrm{a}.$ ${\mathrm{C}}_2{\mathrm{H}}_2$

$\mathrm{b}.$ ${\mathrm{C}}_2(\mathrm{CN}{)}_4$

$\mathrm{c}.$ ${\mathrm{C}}_2(\mathrm{CN}{)}_2$

$\mathrm{d}.$ $\mathrm{CH}\equiv \mathrm{C}-\stackrel{\stackrel{\mathrm{O}}{\parallel }}{\mathrm{C}}-\mathrm{OH}$