JEE Main 2026 — Apr 5, Shift 1 — Chemistry solution

JEE Main2026Apr 5, Shift 1Chemistry

The correct statements about metal carbonyls are

A. The metal-carbon bonds in metal carbonyls possess both $σ$ and $π$ -character.

B. Due to synergic bonding interactions between metals and CO ligand the metal-carbon bond becomes weak.

C. The metal-carbon $σ$ bond is formed by the donation of lone pair of electrons on the carbonyl carbon into a vacant orbital of metal.

D. The metal-carbon $π$ bond is formed by the donation of electrons from filled $d$ -orbital of metal into vacant $π^{*}$ orbital of CO.

Choose the correct answer from the options given below :

Solution

A: Metal-CO bonding involves both a $σ$ -donation and a $π$ -back-donation, giving the M-C bond both characters. Correct.

B: Synergic (back-)bonding reinforces the M-C bond, making it stronger, not weaker. Incorrect.

C: $σ$ -component comes from the lone pair on carbon donating into an empty metal orbital. Correct.

D: $π$ -component comes from filled metal $d$ orbitals donating into the empty $π^{*}$ of CO. Correct.

Correct set: A, C and D.

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