Question

The geometries of mononuclear carbonyl complexes of Cr, Fe, Ni are respectively

• A. Octahedral, trigonal bipyramidal, square planar
• B. Octahedral, trigonal bipyramidal, tetrahedral
• C. Octahedral, octahedral, tetrahedral
• D. Octahedral, octahedral, octahedral

Hint:

When analyzing metal-carbonyl complexes, consider the oxidation state of the metal and its preference for coordination geometry.

Answer 1

The Correct Option is B

Mononuclear carbonyl complexes of Cr, Fe, and Ni follow characteristic geometries based on their atomic size, electron configuration, and coordination preferences. Chromium generally forms octahedral complexes, iron forms trigonal bipyramidal complexes, and nickel typically forms tetrahedral complexes when bonded with carbonyl groups.