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Q.

Which is the incorrect statement regarding resonance contributing structures?

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a

All atoms in a contributing structures must have complete valence shells

b

All contributing structures must have same arrangement of atoms

c

All contributing structures must have same number of valence electrons

d

Equivalent resonance structures have same potential energies

answer is A.

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Detailed Solution

There may be an atom with incomplete valence shell in one or more contributing structure, eg: C+H2−CH=C1H−O −  CH3↔CH2=CH-C+HII−O−C H3↔CH2=CH−CHIII=O+−CH3Both I and II have a carbon atom with sextet of electronswhile III has all its atoms with complete valence shell.
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