Question:

Which of the following statement is NOT the postulate of VSEPR theory?}

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In VSEPR theory, always focus on: bond pairs, lone pairs, and electron pair repulsions around the central atom.
Updated On: Apr 24, 2026
  • Where two or more resonance structures can represent a molecule, the VSEPR model is not applicable to any such structure.
  • A multiple bond is treated as if it is a single electron pair and the two or three electron pairs of a multiple bond are treated as a single super pair.
  • The shape of a molecule depends upon the number of valence shell electron pairs around the central atom.
  • Pairs of electrons in the valence shell repel one another since their electron clouds are negatively charged.
  • The valence shell is taken as a sphere with the electron pairs localising on the spherical surface at maximum distance from one another.
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The Correct Option is A

Solution and Explanation

VSEPR theory is based on electron pair repulsion in the valence shell. Its postulates include:
  • electron pairs repel each other,
  • molecular shape depends on the number of bond pairs and lone pairs,
  • electron pairs arrange themselves to remain as far apart as possible,
  • multiple bonds are treated as one electron domain with stronger repulsion.
Statement (A) says that VSEPR model is not applicable where resonance structures exist. This is not a standard postulate of VSEPR theory. Therefore, statement (A) is not a postulate.
Hence, the correct answer is: \[ \boxed{(A)} \]
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