Resonance is due to

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

In graphite, the $C-C$ bond length $(141.5 \, pm)$ is found to be shorter than the normal $C-C$ single bond length $(154 \, pm)$. This anomaly occurs due to:

$CH_3-C(=O)-OCH_3$. In the given structure,the bond between carbonyl carbon and oxygen is $a$ and the bond between oxygen and methyl group is $b$. The correct relation between the bond lengths $a$ and $b$ is:

The correct bond order of the $B-F$ bond in the $BF_3$ molecule is:

The number of resonance structures for $N$ is