Question

Which of the following is/are example( s) of $\sigma$-bonded organometallic compound ?

• A. Al${}_2$(CH${}_3$)${}_6$
• B. Pb(CH${}_3$)${}_4$
• C. Zn(C${}_2$H${}_5$)${}_2$
• D. Ferrocene

Answer 1

Answer: (A), (B), (C)

Pb(CH${}_3$)${}_4$
Zn(C${}_2$H${}_5$)${}_2$
Al${}_2$(CH${}_3$)${}_6$

Option (A),(B),(C) are correct.Ferrocene is example of organometallic compound but is not $\sigma$-bonded. Its formula is $Fe(C_5{H}_5{)}_2$. It is the prototypical metallocene, a type of organometallic chemical compound consisting of two cyclopentadienyl rings bound on opposite sides of a central metal atom. Such organometallic compounds are also known as sandwich compounds. Each cyclopentadienyl (Cp) ring is then allocated a single negative charge, bringing the number of -electrons on each ring to six, and thus making them aromatic. These twelve electrons (six from each ring) are then shared with the metal via covalent bonding.