Which of the following does not have a metal carbon bond?

• Correct answer
  A

  $\mathrm{Al}\left(\mathrm{OC}_2 \mathrm{H}_5\right)_3$
• B

  $\mathrm{C}_2 \mathrm{H}_5 \mathrm{MgBr}$
• C

  $\mathrm{K}\left[\mathrm{Pt}\left(\mathrm{C}_2 \mathrm{H}_4\right) \mathrm{Cl}_3\right]$
• D

  $\mathrm{Ni}(\mathrm{CO})_4$

Solution

$\mathrm{Al}\left(\mathrm{OC}_2 \mathrm{H}_5\right)_3$ contains bonding through $\mathrm{O}$ and thus it does not have metal-carbon bond.

Hence, the correct answer is option: 'A'.