Sodium fusion extract of an organic compound ( Y ) with CHCl _ 3 and chlorine water gives violet color to the CHCl _ 3 layer. 0.15 g of ( Y ) gave 0.12 g of the silver halide precipitate in Carius method. Percentage of halogen in the compound ( Y ) is \_\_\_\_. (Nearest integer) (Given : molar mass g mol ^ -1 C : 12, H : 1, Cl : 35.5, Br : 80, I : 127)
A. A
The sodium fusion extract gives violet color with CHCl₃ and chlorine water, indicating the presence of iodine. In the Carius method, 0.15 g of compound Y produces 0.12 g of silver halide precipitate (AgI). Molar mass of AgI = 108 + 127 = 235 g/mol. Moles of AgI = 0.12 / 235 = 0.000510 mol. Since each AgI contains one I atom, moles of I = 0.000510 mol. Mass of I = 0.000510 × 127 = 0.0647 g. Percentage of halogen (iodine) in compound Y = (0.0647 / 0.15) × 100 = 43.1%, which rounds to 43% (nearest integer).
Related: Chemistry — General Organic Chemistry · All PYQ Banks