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Basics of Organic Chemistry question

2019 · 10 Jan · Shift 1 · Q19
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Basics of Organic Chemistry question

2019 · 10 Jan · Shift 1 · Q19

JEE MainChemistryBasics of Organic ChemistryMCQ+4 / −1
If dichloromethane (DCM) and water (H2OH_2OH2​O) are used for differential extraction, which one of the following statements is correct ?
  1. A
    DCM and H2OH_2OH2​O would stay as upper and lower layer respectively in the separating funnel (S.F.)
  2. B
    DCM and H2OH_2OH2​O will make turbid/colloidal mixture
  3. C
    DCM and H2OH_2OH2​O would stay as lower and upper layer respectively in the separating funnel(S.F).
  4. D
    DCM and H2OH_2OH2​O will be miscible clearly
View written solutionFree

Correct answer: C

  1. Principle of differential extraction
    For two liquids to be used in a separating funnel, they should be immiscible and form two distinct layers.

  2. Check miscibility of DCM and water
    Dichloromethane (DCM, CH2Cl2CH_2Cl_2CH2​Cl2​) and water are not miscible. So they do not form a clear single phase, and they are not normally described as a stable colloidal mixture.

  3. Compare densities
    The layer positions in a separating funnel depend on density.

    • Density of water ≈1.0 g mL−1\approx 1.0\,\text{g mL}^{-1}≈1.0g mL−1
    • Density of DCM ≈1.33 g mL−1\approx 1.33\,\text{g mL}^{-1}≈1.33g mL−1

    Since 1.33>1.0,1.33 > 1.0,1.33>1.0, DCM is denser than water.

  4. Conclusion about layers
    Therefore, in a separating funnel:

    • DCM forms the lower layer
    • Water forms the upper layer

  5. Evaluate options

    • A: DCM upper, water lower →\rightarrow→ incorrect
    • B: Turbid/colloidal mixture →\rightarrow→ incorrect
    • C: DCM lower, water upper →\rightarrow→ correct
    • D: Completely miscible →\rightarrow→ incorrect

Hence, the correct option is: C\boxed{\text{C}}C​

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