n – Butane is treated with chlorine at250C . The percentage of 1 – chlorobutane formed is (x – 0.2) x 10. The x is

At room temp, the relative rates of abstraction of hydrogenations are 5 : 3.8 : 1                1 - chlorobutane2 - chlorobutane =No. of10 - HNo. of 20 -H x reactivity of 10 Hreactivity of 20 H =64 x 13.8 = 615.2 % of 1 – chlorobutane = 621.2 x 100 = 28.3 % [x – 0.2] 10 = [3 – 0.2] 10 = 28 % [nearly]