Multiple choice

Bartell mechanism is shown by

  1. Indium nitride

  2. Indium phosphide

  3. Iodine heptafluoride

  4. Iodine pentafluoride
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C Correct answer
Explanation

Iodine heptafluoride is the compound IF7. It has an unusual pentagonal bipyramidal structure, as predicted by VSEPR theory. The molecule can undergo a pseudorotational rearrangement called the Bartell mechanism, which is like the Berry mechanism but for a hepta coordinated system.

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