NEETChemistryGeneral Organic Chemistry
Match the elements detected in an organic compound (List-I) with the reagents used and the corresponding observation in their qualitative analysis (List-II). List-I (Element) List-II (Reagent and Observation) (A) Nitrogen (I) Sodium nitroprusside, violet colour (B) Sulphur (II) Ammonium molybdate, yellow precipitate (C) Halogen (III) FeSO₄ followed by conc. H₂SO₄ , Prussian blue colour (D) Phosphorus (IV) AgNO₃ and H
Options
- A(A)-(I), (B)-(III), (C)-(IV), (D)-(II)
- B(A)-(III), (B)-(II), (C)-(IV), (D)-(I)
- C(A)-(III), (B)-(I), (C)-(IV), (D)-(II)
- D(A)-(III), (B)-(I), (C)-(II), (D)-(IV)
Correct answer
C. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
Step-by-step solution
In the qualitative analysis of organic compounds: (A) Nitrogen is detected by boiling the sodium fusion extract with FeSO₄ and then acidifying with concentrated H₂SO₄ , which yields a Prussian blue colour due to the formation of ferriferrocyanide. (B) Sulphur is detected by adding sodium nitroprusside to the sodium fusion extract, resulting in a violet colour. (C) Halogens are detected by acidifying the sodium fusion extract with HNO₃ and adding AgNO₃ , which forms a precipitate (white, pale yellow, or yellow depen