The number of IR bands will be obtain in M(CO)5
  • a) 
    1
  • b) 
    2
  • c) 
  • d) 
    5
Correct answer is option 'B'. Can you explain this answer?

IIT JAM Question

By Ajit Yadav · 2 weeks ago ·IIT JAM
2 Answers
Shivani Thakur answered Jan 16, 2019
Since carbonyl is π acceptor ligand so it accepts electron density from metal ion as well as as a ligand it donates electron density.At a when one carbonyl ligand donates electron density to metal,at the same time another carbonyl accept that electron density from metal.so stretching frequency of donating carbonyl decreases while the stretching frequency of accepting carbonyl increases.thus when carbonyl acts as donar,and when carbonyl acts as acceptor has two different frequencies.

Shivam Tiwari answered Jan 10, 2020
1 due to berry pseudo rotation

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