Amongst the following,covalent bonding is found in:

Why can the maximum covalency of elements of the second period not be more than $4$?

The bond dissociation energy of $B-F$ in $BF_3$ is $646 \ kJ \ mol^{-1}$ whereas that of $C-F$ in $CF_4$ is $515 \ kJ \ mol^{-1}.$ The correct reason for higher $B-F$ bond dissociation energy as compared to that of $C-F$ is

$AlCl_3$ is ...

Which of the following sulphur compounds follows the octet rule?

The two types of bonds present in $B_2H_6$ are covalent and