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NEET2002ChemistryChemical Bonding and Molecular StructureActual

Assertion : Sigma ( is a strong bond, while pi ( ) is a weak bond. Reason : Atoms rotate freely about pi ( ) bond.

Options

  1. AIf both the assertion and reason are true and reason is a correct explanation of the assertion.
  2. BIf both assertion and reason are true but assertion is not a correct explanation of the assertion.
  3. CIf the assertion is true but the reason is false.
  4. DIf both assertion and reason are false.

Correct answer

C. If the assertion is true but the reason is false.

Step-by-step solution

Sigma bonding involves end to end overlapping of the two atomic orbitals e.g. between s and s, s and p and p and p orbitals. Pi bonding ( ) involves sidewise overlapping of the two atomic orbitals e.g. between p and p orbitals. Overlapping of orbitals is more effective in bonding than in -bonding. Due to the geometry of overlapping or orbitals, rotation of one atom is not possible around -bonds.

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