The correct order in which the O-O bond length increases in the following is

1. H₂O₂ < O₂ < O₃

2. O₃ < H₂O < O₂

3. O₂ < O₃< H₂O₂

4. O₂ < H₂O₂ < O₃

The total number of possible resonance forms for the nitrate ion, ($\mathrm{N}{{\mathrm{O}}_3}^{-}$) is: 

The correct order of 'S$—$O' bond length is:

Polarization of electrons in acrolein may be written as: 

(a) $\stackrel{{\delta }^{-}}{C}{H}_2=CH-\stackrel{{\delta }^{+}}{C}H=O$

(b)$\stackrel{{\delta }^{-}}{C}{H}_2=CH-CH=\stackrel{{\delta }^{+}}{O}$

(c) $\stackrel{{\delta }^{-}}{C}{H}_2=\stackrel{{\delta }^{+}}{C}H-CH=O$

(d) $\stackrel{{\delta }^{+}}{C}{H}_2=CH-CH=\stackrel{{\delta }^{-}}{O}$

What is the correct order from the weakest to the strongest carbon-oxygen bond for the following species? 

$CO, C{O}_2, C{O_3}^{2-}, C{H}_{3}OH$

(1) $C{H}_{3}OH <C{O_3}^{2-}<C{O}_2<CO$                         

(2) $CO<C{O}_2 <C{O_3}^{2-}<C{H}_{3}OH$

(3) $C{H}_{3}OH <C{O_3}^{2-}<CO<C{O}_2$                         

(4) $C{H}_{3}OH <C{O}_2<C{O_3}^{2-}<CO$

Which of the following statements is correct?

(1) ${\left(C{H}_3\right)}_3$ COH is less acidic than ${\left(C{H}_3\right)}_3$ SiOH.

(2) Like CO, its analogue of Si is not stable.

(3) In phosgene, C-O bond length is longer than expected while C-Cl bond length is shorter.

(4) All of these

Incorrect statement about resonance is :

1. The resonating structures are hypothetical.

2. The unpaired electrons in various resonating structures are same.

3. Hybrid structure is most energetic.

4. Hybrid structure is least energetic.

An incorrect statement regarding resonating structures is : 

The number of $\mathrm{\pi }$ bonds and $\mathrm{\sigma }$ bonds in the following structure is :

The most preferred structure among the following with the lowest energy for SO₃ is: 

1.		2.
3.		4.