Which one of the following molecules contains no $\pi$ bond?

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

In the following electron-dot structure, calculate the formal charge from left to right for the nitrogen atoms: $: \ddot{N} = N = \ddot{N} :$

Select the pair of compounds in which both have different hybridization but have the same molecular geometry.

Compound $X$ is the anhydride of sulphuric acid. The number of $\sigma$ bonds and the number of $\pi$ bonds present in $X$ are respectively:

Statement $(A)$ $CO_2$ has no dipole moment,whereas $SO_2$ and $H_2O$ have dipole moment.
Statement $(B)$ $SnCl_2$ is ionic,whereas $SnCl_4$ is covalent.
Which of the following is correct?