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The pair of molecules that contain odd electron molecule and expanded octet.

Options

  1. ASF ₆, PCl ₅
  2. BBF ₃, SF 6
  3. CNO ₂, PCl ₅
  4. DNO , AlCl ₃

Correct answer

C. NO ₂, PCl ₅

Step-by-step solution

An odd electron molecule is one that contains an unpaired electron in its valence shell. Among the given options, NO ₂ has a total of 5 + 6 2 = 17 valence electrons, which is an odd number, making it an odd electron molecule. An expanded octet molecule is one where the central atom has more than 8 electrons in its valence shell. In PCl ₅ , the central phosphorus atom is bonded to five chlorine atoms, resulting in 5 2 = 10 electrons in its valence shell, which exceeds the octet rule. Checking other options: SF ₆ has

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