Use the following data to answer the question below.
Calculate the resonance energy of anthracene in $kcal/mol$.

What is a resonance structure? Why are resonance structures required? Explain with a suitable example.

Which of the following statements are true for the nitrate ion $(NO_3^-)$?
$(a)$ The coordination number of $N$ is $3$,and the structure is trigonal planar.
$(b)$ The formal charge on $N$ is $+1$.
$(c)$ The average formal charge on each $O$ atom is $-2/3$.
$(d)$ The average bond order of the $NO$ bond is $4/3$.
$(e)$ All $NO$ bond lengths are identical due to resonance.
Select the correct code:

Which is the most important contributing resonating structure of $[CH_2=N(=O)=O]^-$?

Draw the resonance structures of $NO_2$, state its shape, and indicate the bond angle and bond length.

Write the resonance structures of $CO_3^{2-}$ and $HCO_3^{-}$.