The correct statements about metal carbonyls are Choose the correct answer from the options given below :
- A and B Only
- A, C and D Only
- B and C Only
- A and D Only
Answer
(2) A, C and D Only
Solution
As per NCERT, the metal–carbon bond in metal carbonyls possesses both σ and π character:
• σ bond: lone pair on the carbonyl carbon is donated into a vacant orbital of the metal – C is correct.
• π bond: electrons from a filled metal d orbital are donated into the vacant antibonding π* orbital of CO – D is correct.
These two effects reinforce each other (synergic bonding), which STRENGTHENS the M–C bond – so B is incorrect; A is correct.
∴ Correct statements: A, C and D
Answer: (2)