JEE Main 2026 — Jan 22, Shift 1 — Chemistry solution

JEE Main2026Jan 22, Shift 1Chemistry

Sodium fusion extract of an organic compound (Y) with $C H C l_{3}$ and chlorine water gives violet color to the $C H C l_{3}$ 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)

Your answer

Solution

The violet colour in the $C H C l_{3}$ layer (after treatment with chlorine water) is the standard layer-test signature of iodide — chlorine displaces $I^{-}$ to give free $I_{2}$ , which dissolves in the organic layer giving a violet colour. So the halogen in Y is iodine, and the precipitate is AgI (M = 235 g/mol).

$% I = \frac{atomic mass of I}{molar mass of AgI} \times \frac{mass of AgI}{mass of Y} \times 100$ .

$= \frac{127}{235} \times \frac{0.12}{0.15} \times 100 = 0.5404 \times 0.8 \times 100 = 43.23% \approx 43%$ .

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