Exams › NEET › Chemistry

As the positive charge on the central metal atom increases, the less readily the metal can donate electron density into the π* orbitals of CO ligand to weaken the C—O bond. Hence, the C—O bond would be strongest in:

1. [Mn(CO)6]+
2. [Fe(CO)6]2+
3. [Cr(CO)6]
4. [V(CO)6]−

Correct answer: [Fe(CO)6]2+

Solution

As the positive charge on the metal increases, back-donation of electron density from the metal to the π* orbitals of CO decreases, strengthening the C—O bond. [Fe(CO)6]2+ has the highest positive charge, making the C—O bond strongest.

Related NEET Chemistry questions

• What is the IUPAC name of \( K_{2}\left[P t C l_{6}\right] ? \)
• The structures of \( \left[N i(C O)_{4}\right] \) and \( \left[N i\left(\left(P h_{3}\right)_{3} P\right)_{2} C l_{2}\right] \) are:
• The IUPAC name of \( \left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{4}\right]\left[\mathrm{NiCl}_{4}\right] \) is :
• Some salts, although containing two different metallic elements, give test for one of them in solution. Such salts are:
• Actinides have higher tendency to form complexes than Lanthanides, due to
• Select the correct order of ions with respect to their ionic radii.

⚔️ Practice NEET Chemistry free + battle 1v1 →