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COMEDK2022ChemistryChemical Bonding and Molecular Structure

Which of the following compound does not exists?

Options

  1. ANCl ₃
  2. BNCl ₅
  3. CSbCl ₃
  4. DNI ₃

Correct answer

B. NCl ₅

Step-by-step solution

Nitrogen is a member of the second period of the periodic table and lacks vacant d-orbitals in its valence shell. The electronic configuration of nitrogen is 1s² 2s² 2p³ . Due to the absence of d-orbitals, nitrogen cannot expand its octet beyond a covalency of 4. It can form compounds like NCl ₃ where nitrogen is bonded to three chlorine atoms and has one lone pair, satisfying the octet rule. In NCl ₅ , nitrogen would need to form five covalent bonds, which would require the expansion of its octet to 10 electrons.

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