JEE Main · 2026 · 22 Jan 2026 · Shift 1 · Practical and Analytical Chemistry

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)

Answer: 43

Solution

A violet colour in the chloroform layer with chlorine water shows that the halogen set free is iodine, so the precipitate collected in the Carius estimation is silver iodide, of molar mass

108 + 127 = 235 g mo l^{- 1}

. The iodine present in that precipitate is

\frac{127}{235} \times 0.12 g

, and the percentage of iodine in the compound is

\frac{127}{235} \times \frac{0.12}{0.15} \times 100 = \frac{10160}{235} = 43.2%

. To the nearest integer the halogen content is

43%

JEE Main · 2026 · 22 Jan 2026 · Shift 1 · Integer answer

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JEE Main · 2026 · 22 Jan 2026 · Shift 1 · Practical and Analytical Chemistry

Solution

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