Multiple choice

Which of the following metal carbonyl absorbs lowest infrared frequency?

  1. [V(CO)6]-

  2. [Ti(CO)6]--

  3. [Mn(CO)6]+

  4. [Cr(CO)6]

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This option is correct,  because the two excess electron of metal ions shifted towards antibonding MOs of CO ligand resulting CO bond order is very low, due to this fact infrared frequency highly decreases.

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