The rate of alkene coordination to $\left[\mathrm{PtCl}_{4}\right]^{2-}$ is highest for
(a)norbornene
(b)ethylene
(c)cyclohexene
(d)1-butene
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
Strained alkenes coordinate fastest: norbornene's ring strain is relieved on binding, so it displaces chloride from [PtCl₄]²⁻ much faster than ethylene, 1-butene or cyclohexene.