Question:medium

Ferrocene is:

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Ferrocene exhibits aromatic stability and undergoes electrophilic substitution reactions like benzene.
Updated On: Jan 13, 2026
  • \( Fe(\eta^5 - C_5H_5)_2 \)
  • \( Fe(\eta^2 - C_5H_5)_2 \)
  • \( Cr(\eta^5 - C_5H_5)_5 \)
  • \( Os(\eta^5 - C_5H_5)_2 \)
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The Correct Option is A

Solution and Explanation

Step 1: Ferrocene Definition
Ferrocene is an organometallic compound featuring an iron (Fe\(^2+\)) core.
It is structured with two cyclopentadienyl (\( C_5H_5^- \)) rings sandwiching the metal center.
Step 2: Bonding Characteristics
The hapticity (\(\eta^5\)) signifies that all five carbon atoms within each ring engage with the metal.
This configuration results in a stable and symmetrical molecular arrangement.
Final Answer: The chemical formula for ferrocene is \( Fe(\eta^5 - C_5H_5)_2 \).
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