Which of the following is a Lewis acid?

$A$ covalent bond is likely to be formed between two elements which

The hydrogen chloride molecule contains a

Which of the following forces holds the carbon atoms together in diamond?

State the number of covalent bonds in $H_{2}O$ and $CCl_{4}$ and provide their bond structures and Lewis structures.

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