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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3cc212

Which statements about are correct?

  1. AIt has three bridging CO groups
  2. BEach Fe attains 18 electrons when one Fe-Fe bond is counted
  3. CIt has six terminal CO groups
  4. DIt is paramagnetic

Answer: A, B, C

The structure has three bridging and six terminal (A, C). Electron count on each Fe: 8 (Fe) + 1 (Fe-Fe bond) + 3 (three bridging CO at 1 each) + 6 (three terminal CO at 2 each) = 18 (B). All electrons are paired, so it is diamagnetic (D false). Correct: A, B, C.
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