The Born-Haber cycle can be used to estimate:

Which of the following molecules has the weakest $(p \pi - d \pi)$ back bonding?

Which of the following compounds is not hypovalent but completes its octet?

In the Lewis dot structure of carbonate ion shown,the formal charges on the oxygen atoms $1, 2,$ and $3$ are respectively:

The option$(s)$ in which at least three molecules follow the Octet Rule is(are):
$(A)$ $CO_2, C_2H_4, NO$ and $HCl$
$(B)$ $NO_2, O_3, HCl$ and $H_2SO_4$
$(C)$ $BCl_3, NO, NO_2$ and $H_2SO_4$
$(D)$ $CO_2, BCl_3, O_3$ and $C_2H_4$

Which of the following consists of an equal number of $p\pi - p\pi$ and $p\pi - d\pi$ bonds?