Resonance

For phenol, which of the following resonating structure is the most stable?

Among these canonical structures, the correct order of stability is

Write resonance structure of ${\mathrm{CH}}_2=\mathrm{CH}-\mathrm{CHO}$. 

In which of the following compounds resonance does not occurs :

(a) ${\mathrm{H}}_2\mathrm{O}$        (b) ${\mathrm{SiO}}_2$            (c) ${\mathrm{SO}}_3$         (d) ${\mathrm{CO}}_2$

The $\mathrm{N}-\mathrm{O}$ bond in ${\mathrm{NO}}_2^{-}$ is shorter than $\mathrm{N}-\mathrm{O}$ bond in ${\mathrm{NO}}_3^{-}.$ Account for this observation.

Draw the resonance hybrid of ozone.

What is the need of resonating structure for a molecule?

Explain the importance of resonance energy.

Define resonance energy.

Which statement is true? 

Why do we need to draw resonating structures for a molecule?

Discuss the necessary condition for resonance.

Assertion. The resonance hybrid is more stable than any of the contributing structure.

Reason. The contributing structures contain the same number of unpaired electrons and have real existence.

Consider the following resonating structure. What will be the correct decreasing order of stability?

In carbonate ion, all three carbon - oxygen bonds are equivalent in all respects, viz, length, energy. The average bond order of the carbon-oxygen bond is 

Round of your answer up to two decimal places.

Which of the following statements are correct for butadiene

$\stackrel{4}{\mathrm{C}}{\mathrm{H}}_2=\stackrel{3}{\mathrm{C}}\mathrm{H}-\stackrel{2}{\mathrm{C}}\mathrm{H}=\stackrel{1}{\mathrm{C}}{\mathrm{H}}_2$

(1) The ${\mathrm{C}}_1-{\mathrm{C}}_2$ and ${\mathrm{C}}_3-{\mathrm{C}}_4$ bonds are longer than a carbon-carbon double bond.

(2) The ${\mathrm{C}}_1-{\mathrm{C}}_2$ and ${\mathrm{C}}_3-{\mathrm{C}}_4$ bonds are shorter than a carbon-carbon double bond.

(3) The ${\mathrm{C}}_2-{\mathrm{C}}_3$ bond is slightly shorter than a carbon-carbon single bond.

(4) The ${\mathrm{C}}_2-{\mathrm{C}}_3$ bond is slightly longer than a carbon-carbon single bond.

Select the incorrect statement about the following

Which of the following molecules does not show any resonating structures?

The nitrite ion in represented by

(I) ${\left[O-N=O\right]}^{-}$

(II) ${\left[N=O-O\right]}^{-}$

Which of the structures represents possible resonance forms of this ion?

Bond order in benzene is