(B) When an organic compound is fused with sodium metal,the elements present in the compound (such as $N$,$S$,and halogens $X$) are converted from the

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Conversion of covalently bonded elements into ionic compounds

(B) When an organic compound is fused with sodium metal,the elements present in the compound (such as $N$,$S$,and halogens $X$) are converted from their covalent form into their corresponding ionic forms (such as $NaCN$,$Na_2S$,and $NaX$). This is the principle behind the Lassaigne's test.

Class 11 Chemistry 3 Organic Chemistry: Purification and Characterisation Chemical analysis of organic compounds

Easy

What happens when an organic compound is fused with sodium metal?

A
Formation of covalent compounds
B
Conversion of covalently bonded elements into ionic compounds
C
Decomposition of the organic compound into carbon and hydrogen
D
No reaction occurs

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Class 11 Questions

Class 11

Chemistry Questions

Chapter

3 Organic Chemistry: Purification and Characterisation

Subtopic

Chemical analysis of organic compounds

Match the compounds in Column $I$ with their characteristic test$(s)$ reaction$(s)$ given in Column $II$.

Column $I$ Column $II$

$A. H_2N-NH_3^+Cl^-$ $p. \text{Sodium fusion extract of the compound gives Prussian blue colour with } FeSO_4$

$B. HO-C_6H_4-CH(NH_3^+)COOH \text{ (with } I^- \text{ counterion)}$ $q. \text{Gives positive } FeCl_3 \text{ test}$

$C. HO-C_6H_4-NH_3^+Cl^-$ $r. \text{Gives white precipitate with } AgNO_3$

$D. (NO_2)_2C_6H_3-NH-NH_3^+Br^-$ $s. \text{Reacts with aldehydes to form the corresponding hydrazone derivative}$

Column $I$	Column $II$
$A. H_2N-NH_3^+Cl^-$	$p. \text{Sodium fusion extract of the compound gives Prussian blue colour with } FeSO_4$
$B. HO-C_6H_4-CH(NH_3^+)COOH \text{ (with } I^- \text{ counterion)}$	$q. \text{Gives positive } FeCl_3 \text{ test}$
$C. HO-C_6H_4-NH_3^+Cl^-$	$r. \text{Gives white precipitate with } AgNO_3$
$D. (NO_2)_2C_6H_3-NH-NH_3^+Br^-$	$s. \text{Reacts with aldehydes to form the corresponding hydrazone derivative}$

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Why is nitric acid $(HNO_3)$ added to sodium extract before adding silver nitrate $(AgNO_3)$ for testing halogens?

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In Kjeldahl's method of estimation of $N$,$CuSO_4$ acts as

Medium

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Which of the following substances will give the Lassaigne's test for nitrogen?

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Match List-$I$ with List-$II$.
List-$I$ (Functional group detection) List-$II$ (Change observed during detection)
$A$. Unsaturation (Baeyer's test) $I$. Red colour appears
$B$. Alcoholic group (Ceric ammonium nitrate test) $II$. Silver mirror appears
$C$. Aldehyde group (Tollen's reagent) $III$. Violet colour appears
$D$. Phenolic group ($FeCl_3$ test) $IV$. Discharge of pink colour

Choose the correct answer from the options given below:

List-$I$ (Functional group detection)	List-$II$ (Change observed during detection)
$A$. Unsaturation (Baeyer's test)	$I$. Red colour appears
$B$. Alcoholic group (Ceric ammonium nitrate test)	$II$. Silver mirror appears
$C$. Aldehyde group (Tollen's reagent)	$III$. Violet colour appears
$D$. Phenolic group ($FeCl_3$ test)	$IV$. Discharge of pink colour

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