First slide

Organic reagents and intermediates

Question

Which is the incorrect statement regarding resonance contributing structures?

Moderate

A

All contributing structures must have same number of valence electrons
B

All contributing structures must have same arrangement of atoms
C

All atoms in a contributing structures must have complete valence shells
D

Equivalent resonance structures have same potential energies

Solution

There may be an atom with incomplete valence shell in one or more contributing structure, e.g.
Both I and II have a carbon atom with sextet of electrons while III has all its atoms with complete valence shell.

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