Question

The reaction that proceeds through an oxidative addition followed by a reductive elimination is:

[Given: Atomic numbers Ni = 28, Ta = 73, Zr = 40, Pt = 78]

• A.
• B.
• C.
• D.

Hint:

Oxidative addition and reductive elimination are commonly observed in the chemistry of late transition metals like Pd, Pt, and Ni. Early transition metals like Ta and Zr typically undergo sigma-bond metathesis instead.

Answer 1

The Correct Option is D

Oxidative addition and reductive elimination are key steps in organometallic catalytic cycles. These typically involve transition metals with variable oxidation states, particularly those from the late transition metals such as Ni, Pd, Pt.

Let’s analyze each option:

• (A) Nickel complex performs insertion reactions and ligand exchange. It does not undergo a clear oxidative addition followed by reductive elimination. WRONG
• (B) Ta (Tantalum) is an early transition metal and generally does not undergo oxidative addition. This is a simple sigma-bond metathesis. WRONG
• (C) Zr (Zirconium) also follows sigma-bond metathesis, not oxidative addition. WRONG
• (D) Platinum complex clearly undergoes oxidative addition of C–H bond (Pt(II) to Pt(IV)) followed by reductive elimination of CH₄. CORRECT

Therefore, the only reaction proceeding through oxidative addition and reductive elimination is:

\[ \boxed{(D)} \]