Which of the following conditions is not correct for resonating structures?

  • A
    The contributing structures must have the same number of unpaired electrons.
  • B
    The contributing structures should have almost similar energies.
  • C
    The contributing structures should be so written that unlike charges reside on atoms that are far apart.
  • D
    The positive charge should be present on the electropositive element and the negative charge on the electronegative element.

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$A$ molecule may be represented by three structures having energies $E_1$,$E_2$ and $E_3$,respectively. The energies of these structures follow the order $E_3 < E_2 < E_1$. If the experimental bond energy of the molecule is $E_0$,the resonance energy is

Taking into account hybridization and resonance effects,rank the following $C-O$ bonds in order of decreasing bond length. The structure provided is the carbonate ion $(CO_3^{2-})$.

Which of the following resonating structures of $1$-methoxy-$1, 3$-butadiene is least stable?

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

The correct order of $C-O$ bond length is:

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