In graphite,carbon atoms are joined together due to

Which of the following elements can be involved in $p \pi-d \pi$ bonding with oxygen?

The $X-X$ bond length is $1.00 \mathring{A}$ and $C-C$ bond length is $1.54 \mathring{A}$. If $EN$ of $X$ and $C$ are $3.0$ and $2.0$ respectively,the $C-X$ bond length is likely to be ............ $\mathring{A}$.

Which of the following have $3c-2e^-$ bonds?
$I. \ Al_2Cl_6, \ II. \ B_2H_6, \ III. \ Fe_2Cl_6, \ IV. \ Si_2H_6$

Which of the following is the strongest bond?

What is the formal charge on the carbon atom in the $CO_3^{2-}$ ion?