Practical Organic Chemistry · Chemistry · COMEDK
MCQ (Single Correct Answer)
1
$$ \text { Match the mixtures listed in Column I with the correct method used for their separation. } $$
| $$ \text { Column I } $$ |
$$ \text { Column I } $$ |
||
|---|---|---|---|
| A | Glycerol from spent Lye | P | Steam distillation |
| B | Mixture of Benzoic acid and Naphthalene dissolved in organic solvent | Q | Distillation |
| C | Aniline & Chloroform | R | Distillation under reduced pressure |
| D | 2- Nitrophenol & 4- Nitrophenol | S | Differential extraction using $\mathrm{NaHCO}_3$ |
COMEDK 2026 Morning Shift
2
Lassaigne's test for the detection of nitrogen fails in
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3
The best method for the separation of $o$-nitrophenol and $p$-nitrophenol from their mixture is :
COMEDK 2025 Afternoon Shift
4
In the estimation of element $$\mathrm{X}$$ in an organic compound, $$0.8 \mathrm{~g}$$ of the compound containing $$\mathrm{X}$$ was heated with fuming $$\mathrm{HNO}_3$$ and the cooled product was treated with barium chloride. The mass of barium sulphate precipitated was $$1.2 \mathrm{~g}$$. What is the percentage of element $$\mathrm{X}$$ and what is the formula of the violet-coloured compound formed when Lassaigne's extract of the organic compound is treated with sodium nitroprusside?
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5
Presence of halogen in organic compounds can be detected using
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