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Practical Organic Chemistry question

2021 · 20 Jul · Shift 2 · Q15
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Practical Organic Chemistry question

2021 · 20 Jul · Shift 2 · Q15

JEE MainChemistryPractical Organic ChemistryMCQ+4 / −1
In Carius method, halogen containing organic compound is heated with fuming nitric acid in the presence of :
  1. A
    HNO3HNO_3HNO3​
  2. B
    AgNO3AgNO_3AgNO3​
  3. C
    CuSO4CuSO_4CuSO4​
  4. D
    BaSO4BaSO_4BaSO4​
View written solutionFree

Correct answer: B

  1. Recall the Carius method

    The Carius method is used for the estimation of halogens in an organic compound.

  2. Principle of the method

    The halogen-containing organic compound is heated in a sealed tube with fuming nitric acid.

    • The organic part is oxidized.
    • The halogen is converted into the corresponding halide ion.
    • In the presence of silver nitrate, the halogen forms a precipitate of silver halide:
    X−+Ag+→AgXX^- + Ag^+ \rightarrow AgXX−+Ag+→AgX

    where X=Cl,Br,IX = Cl, Br, IX=Cl,Br,I.

  3. Identify the reagent used with fuming nitric acid

    In Carius method, the compound is heated with fuming HNO3HNO_3HNO3​ in the presence of AgNO3AgNO_3AgNO3​.

  4. Evaluate the options

    • A: HNO3HNO_3HNO3​ — Incorrect, because fuming nitric acid is already mentioned; the additional required reagent is not HNO3HNO_3HNO3​.
    • B: AgNO3AgNO_3AgNO3​ — Correct, silver nitrate is used to precipitate halogens as AgXAgXAgX.
    • C: CuSO4CuSO_4CuSO4​ — Incorrect.
    • D: BaSO4BaSO_4BaSO4​ — Incorrect.

  5. Final answer

    Therefore, the correct option is:

    B: AgNO3\boxed{\text{B: } AgNO_3}B: AgNO3​​
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