Question

Iron carbonyl, $\mathrm{Fe}{\left(\mathrm{CO}\right)}_5$ is __________.

• A. trinuclear
• B. tetranuclear
• C. binuclear
• D. mononuclear

Answer 1

The correct option is D

mononuclear

Explanation for correct answer

Correct answer : (4) mononuclear

Iron carbonyl

Iron carbonyl $\left[\mathrm{Fe}{\left(\mathrm{CO}\right)}_5\right]$is a mononuclear in which one Fe atom is surrounded by five CO ligands.

Mononuclear complexes have only one metal atom or ion and surrounded by ligands.

Structure of Iron carbonyl

The Iron carbonyl structure shows one carbon atom surrounded by carbonyl ligands, hence, it is a mononuclear species.

Explanation for Incorrect answer

(1) The one iron atom is present in the complex, therefore, option 1 is incorrect.

(2) Tetranuclear nuclease is absent, hence, option 2 is incorrect.

(3) Binuclear Iron is not present in the complex, instead mononuclear iron atom is present, hence, option 3 is incorrect.