The ratio of lone pair of electrons to bond pair of electrons in an ozone $(O_3)$ molecule is

Select true or false statements :
$(a)$ Promotion of electron is essential condition prior to hybridisation
$(b)$ In $VSEPR$ theory,two or three electron pairs of a multiple bond are treated as a single super pair
$(c)$ Bond length for $CO_2$ lies between double and triple bonds
$(d)$ $Ne_2$ does not exist

Identify the correct sequence of increasing number of $\pi$-bonds in the structure of the following molecules:
$(I) \ H_2S_2O_6 \ \ \ \ \ \ \ \ \ (II) \ H_2S_2O_3 \ \ \ \ \ \ \ \ \ (III) \ H_2S_2O_5$

Identify the set of molecules/ions that are isoelectronic.

Which of the following fluoro compounds acts as a Lewis base?

Which of the following pairs are isostructural?