Which of the following has a different number of $p_{\pi}-d_{\pi}$ bonds compared to the other molecules?

The number of $S-S$,$S-O-S$,and $O-H$ linkages in a molecule of pyrosulphurous acid $(H_2S_2O_5)$ are respectively

The correct order of bond length is:

Which of the following attractions is the strongest?

Which of the following formulas does not correctly represent the bonding capacity of the atom involved?

The $B-F$ bond dissociation energy in $BF_3$ is $646 \, kJ \, mol^{-1}$,whereas the $C-F$ bond dissociation energy in $CF_4$ is $515 \, kJ \, mol^{-1}$. Which of the following is the correct reason for the $B-F$ bond dissociation energy being higher than the $C-F$ bond dissociation energy?