Ethenyl cyclopropene isomerizes at 640 K to yield several products. If the product ratio is determined entirely by kinetics (so the products are not allowed to come to equilibrium), then the relative yields are as follows: (1) 3-methylcyclobutene, 96.2%; (2) 1,4-pentadiene, 1.5%; (3) cis-1,3-pentadiene, 1.2%; (4) trans-1,3-pentadiene, 1.1%. If the half-life of ethenyl cyclopropene overall is 1570 s, estimate the rate constants k₁ , k₂ , k₃ , and k₄ for formation of the four products.