Liebig method is used for the estimation of

Important Questions on Organic Chemistry- Some Basic Principles and Techniques

EASY

Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

Reagent, $1-$naphthylamine and sulphanilic acid in acetic acid is used for the detection of

EASY

Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

Acetic acid reacts with sodium metal at room temperature to produce

MEDIUM

Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

Which of the following compound is added to the sodium extract before addition of silver nitrate for testing of halogens?

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

In the following reaction



The major product is

EASY

Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

Which of the following compound will give blood red colour while doing the Lassaigne's test for $\mathrm{N}$.

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

In Lassaigne's test, on boiling sodium thiocyanate with ferrous sulphate produces

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

Phenol can be distinguished from ethanol by the reagent

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

Using Kjeldahl's method over $1 \mathrm{g}$ of a soil sample, the ammonia evolved could neutralize $25\mathrm{ml}$ of $1{\mathrm{MH}}_2{\mathrm{SO}}_4$. Then, the percentage of nitrogen present in the sample is

MEDIUM

Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

When nitrogen and chlorine containing organic compound is reacted with sodium metal, it forms

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

In the detection of nitrogen of an organic compound by Lassaigne's test, a prussian blue colour is obtained. This is due to the formation of which of the following complexes?

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

The reddish brown precipitate formed in the Fehling's test for aldehydes (RCHO) is due to the formation of

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

The correct match between item $\mathrm{I}$ and item $\mathrm{II}$ is
 

Item $\mathrm{I}$ (Compound)		Item $\mathrm{II}$ (Reagent)
$\mathrm{a}.$	Lysine	$\mathrm{p}.$	$1-$naphthol
$\mathrm{b}.$	Furfural	$\mathrm{q}.$	Ninhydrin
$\mathrm{c}.$	Benzyl alcohol	$\mathrm{r}.$	${\mathrm{KMnO}}_4$
$\mathrm{d}.$	Styrene	$\mathrm{s}.$	Ceric ammonium nitrate

EASY

Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

Which one of the following set of elements can be detected using sodium fusion extract?

HARD

Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

Match List-I with List-II 

	List-I		List-II
	Test/Reagents/Observation(s)		Species detected
(a)	Lassaigne's Test	(i)	Carbon
(b)	Cu(II) oxide	(ii)	Sulphur
(c)	Silver nitrate	(iii)	$\mathrm{N}, \mathrm{S}, \mathrm{P}$, and halogen
(d)	The sodium fusion extract gives black precipitate with acetic acid and lead acetate	(iv)	Halogen Specifically

The correct match is :

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

The potassium ferrocyanide solution gives a Prussian blue colour, when added to :

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

In Lassaigne's test for halogens, it is necessary to remove $\text{'}\mathrm{X}\text{'}$ and $\text{'}\mathrm{Y}\text{'}$ from the sodium fusion extract, if nitrogen and Sulphur are present. This is done by boiling the extract with $\text{'}\mathrm{Z}\text{'}$. Identify $\mathrm{X}, \mathrm{Y}$ and $\mathrm{Z}$.

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

An iodo-organic compound, when fused with sodium metal, followed by acidification with nitric acid and then treated with silver nitrate gives

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

During the fusion of organic compound with sodium metal, nitrogen present in the organic compound is converted into

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

Sodium extract is heated with concentrated $\mathrm{H}\mathrm{N}{\mathrm{O}}_3$ before testing for halogens because :

HARD

Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

Match the organic compounds in column - $\mathrm{I}$ with the Lassaigne's test result in column - $\mathrm{II}$ appropriately:
 

	Column – $\mathrm{I}$		Column - $\mathrm{II}$
A.	Aniline	i.	Red colour with $\mathrm{F}\mathrm{e}\mathrm{C}{\mathrm{l}}_3$
B.	Benzene sulfonic acid	ii.	Violet color with sodium nitroprusside
C.	Thiourea	iii.	Blue color with and acidic solution of $\mathrm{F}\mathrm{e}\mathrm{S}{\mathrm{O}}_4$