COMEDK 2026 Morning Shift | Practical Organic Chemistry Question 1 | Chemistry

$$ \text { Column I } $$		$$ \text { Column I } $$
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 $\mathrm{NaHCO}_3$

$$ A-Q \quad B-R \quad C-S \quad D-P $$

$$ A-R \quad B-S \quad C-Q \quad D-P $$

$$ A-R \quad B-P \quad C-S \quad D-Q $$

COMEDK 2026 Morning Shift

MCQ (Single Correct Answer)

-0

Lassaigne's test for the detection of nitrogen fails in

$\mathrm{NH}_2-\mathrm{NH}_2 \mathrm{HCl}$

$\mathrm{NH}_2 \mathrm{CONHNH}_2 \mathrm{HCl}$

$\mathrm{C}_6 \mathrm{H}_5 \mathrm{NHNH}_2 \mathrm{HCl}$

$\mathrm{NH}_2 \mathrm{CONH}_2$

COMEDK 2025 Afternoon Shift

MCQ (Single Correct Answer)

-0

The best method for the separation of $o$-nitrophenol and $p$-nitrophenol from their mixture is :

Crystallisation

Steam distillation

Sublimation

Simple distillation

COMEDK 2024 Evening Shift

MCQ (Single Correct Answer)

-0

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?

$$ 30.24 \quad \& \quad \mathrm{Na}_3\left[\mathrm{Fe}(\mathrm{CN})_4 \mathrm{NOS}\right] $$

$$ 20.6 \quad \& \quad \mathrm{Na}_4\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NOS}\right] $$

$$ 40.27 \quad \& \quad \mathrm{Na}\left[\mathrm{Fe}(\mathrm{CN})_3 \mathrm{NOS}\right] $$

$$ 9.156 \quad \& \quad \mathrm{Na}_3\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NO}\right] $$

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