Organic Chemistry Basics 2 Question 9
9. If dichloromethane (DCM) and water $\left(\mathrm{H}_{2} \mathrm{O}\right)$ are used for differential extraction, which one of the following statements is correct?
(2019 Main, 10 Jan I)
(a) DCM and $\mathrm{H}_{2} \mathrm{O}$ would stay as lower and upper layer respectively in the S.F.
(b) DCM and $\mathrm{H}_{2} \mathrm{O}$ would stay as upper and lower layer respectively in the separating funnel (S.F.)
(c) DCM and $\mathrm{H}_{2} \mathrm{O}$ will be miscible clearly
(d) DCM and $\mathrm{H}_{2} \mathrm{O}$ will make turbid/colloidal mixture
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Answer:
Correct Answer: 9. (a)
Solution:
- Dichloromethane, DCM $\left(\mathrm{CH}{2} \mathrm{Cl}{2}\right)$ is heavier (density $=1.3266 \mathrm{~g} \mathrm{~cm}^{-3}$ ) than water (density $=1 \mathrm{~g} \mathrm{~cm}^{-3}$ ). So, DCM and $\mathrm{H}_{2} \mathrm{O}$ will stay as lower and upper layer respectively in the separating funnel ( $\mathrm{SF}$ ).
