The rate of the reaction $\mathrm{Ni}(\mathrm{CO})_{4}+\mathrm{PPh}_{3} \xrightarrow{\Delta}\left[\mathrm{Ni}(\mathrm{CO})_{3}\left(\mathrm{PPh}_{3}\right)\right]+\mathrm{CO}$ depends on
(a)Concentration of both the reactants
(b)Concentration of $\mathrm{Ni}(\mathrm{CO})_{4}$ only
(c)Concentration of $\mathrm{PPh}_{3}$ only
(d)The steric bulk of $\mathrm{PPh}_{3}$
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
Substitution on the 18-electron Ni(CO)₄ is dissociative: rate = k[Ni(CO)₄], independent of the phosphine concentration.