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CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317505 Organic compound is fused with metallic sodium for testing nitrogen, sulphur and halogens because:

1 To make the solution alkaline

2 To convert into elemental state of nitrogen, sulphur and halogens.

3 To convent covalent compound in to ionic compound.

4 To decrease fusion temperature.

Explanation:

To convert into ionic form $(NaCN, N a_{2} S, NaX)$ as organic compounds react slowly (covalent compounds).

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317478 In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with ${Fe}^{3 +}$ due to the formation of

1

NaSCN

2

[Fe(CN)_{5} NOS]^{4 -}

3

[Fe (SCN)]^{2 -}

4

{Fe}_{4} {[Fe ({CN}_{6})]}_{3} \cdot {xH}_{2} O

Explanation:

If nitrogen and sulphur both are present in an organic compound, sodium thiocyanate is formed, it gives blood red colour but not prussian blue since there are no free cyanide ions with ferric ions.
$Na + C + N + S \to NaSCN$
$F e^{+ 3} + SC N^{⊖} \to \underset{Blood red}{{[Fe (SCN)]}^{2 -}}$

NEET - 2023

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317479 In Lassaigne's test thiourea is converted into

1

NaCNS

2

{Na}_{2} S

3

NaCN

4

{Na}_{2} {SO}_{4}

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317480 Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration which confirms the presence of

1

S

and

Cl

2 N and

S

3

N

4

S

Explanation:

Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration, which confirms the presence of $N$ and S. Sodium metal (if not used in excess) in compounds containing $N$ and $S$ together forms sodium thiocyanate.
$\begin{aligned} Na + C + N + S \to \underset{Sodium thiocyanate}{NaCNS} \\ {Fe}^{3 +} + 3 {CNS}^{-} \to \underset{Blood red ppt.}{Fe (CNS)_{3}} \end{aligned}$

KCET - 2007

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317481 Which of the following compound will give blood red colour while doing the Lassaigne's test for $N$ ?

1

{({NH}_{2})}_{2} C = O

2

H_{2} N (C_{6} H_{4}) {SO}_{3} H

3

C_{6} H_{5} {SO}_{3} H

4

{CHCl}_{3}

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317505 Organic compound is fused with metallic sodium for testing nitrogen, sulphur and halogens because:

1 To make the solution alkaline

2 To convert into elemental state of nitrogen, sulphur and halogens.

3 To convent covalent compound in to ionic compound.

4 To decrease fusion temperature.

Explanation:

To convert into ionic form $(NaCN, N a_{2} S, NaX)$ as organic compounds react slowly (covalent compounds).

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317478 In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with ${Fe}^{3 +}$ due to the formation of

1

NaSCN

2

[Fe(CN)_{5} NOS]^{4 -}

3

[Fe (SCN)]^{2 -}

4

{Fe}_{4} {[Fe ({CN}_{6})]}_{3} \cdot {xH}_{2} O

Explanation:

If nitrogen and sulphur both are present in an organic compound, sodium thiocyanate is formed, it gives blood red colour but not prussian blue since there are no free cyanide ions with ferric ions.
$Na + C + N + S \to NaSCN$
$F e^{+ 3} + SC N^{⊖} \to \underset{Blood red}{{[Fe (SCN)]}^{2 -}}$

NEET - 2023

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317479 In Lassaigne's test thiourea is converted into

1

NaCNS

2

{Na}_{2} S

3

NaCN

4

{Na}_{2} {SO}_{4}

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317480 Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration which confirms the presence of

1

S

and

Cl

2 N and

S

3

N

4

S

Explanation:

Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration, which confirms the presence of $N$ and S. Sodium metal (if not used in excess) in compounds containing $N$ and $S$ together forms sodium thiocyanate.
$\begin{aligned} Na + C + N + S \to \underset{Sodium thiocyanate}{NaCNS} \\ {Fe}^{3 +} + 3 {CNS}^{-} \to \underset{Blood red ppt.}{Fe (CNS)_{3}} \end{aligned}$

KCET - 2007

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317481 Which of the following compound will give blood red colour while doing the Lassaigne's test for $N$ ?

1

{({NH}_{2})}_{2} C = O

2

H_{2} N (C_{6} H_{4}) {SO}_{3} H

3

C_{6} H_{5} {SO}_{3} H

4

{CHCl}_{3}

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317505 Organic compound is fused with metallic sodium for testing nitrogen, sulphur and halogens because:

1 To make the solution alkaline

2 To convert into elemental state of nitrogen, sulphur and halogens.

3 To convent covalent compound in to ionic compound.

4 To decrease fusion temperature.

Explanation:

To convert into ionic form $(NaCN, N a_{2} S, NaX)$ as organic compounds react slowly (covalent compounds).

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317478 In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with ${Fe}^{3 +}$ due to the formation of

1

NaSCN

2

[Fe(CN)_{5} NOS]^{4 -}

3

[Fe (SCN)]^{2 -}

4

{Fe}_{4} {[Fe ({CN}_{6})]}_{3} \cdot {xH}_{2} O

Explanation:

If nitrogen and sulphur both are present in an organic compound, sodium thiocyanate is formed, it gives blood red colour but not prussian blue since there are no free cyanide ions with ferric ions.
$Na + C + N + S \to NaSCN$
$F e^{+ 3} + SC N^{⊖} \to \underset{Blood red}{{[Fe (SCN)]}^{2 -}}$

NEET - 2023

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317479 In Lassaigne's test thiourea is converted into

1

NaCNS

2

{Na}_{2} S

3

NaCN

4

{Na}_{2} {SO}_{4}

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317480 Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration which confirms the presence of

1

S

and

Cl

2 N and

S

3

N

4

S

Explanation:

Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration, which confirms the presence of $N$ and S. Sodium metal (if not used in excess) in compounds containing $N$ and $S$ together forms sodium thiocyanate.
$\begin{aligned} Na + C + N + S \to \underset{Sodium thiocyanate}{NaCNS} \\ {Fe}^{3 +} + 3 {CNS}^{-} \to \underset{Blood red ppt.}{Fe (CNS)_{3}} \end{aligned}$

KCET - 2007

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317481 Which of the following compound will give blood red colour while doing the Lassaigne's test for $N$ ?

1

{({NH}_{2})}_{2} C = O

2

H_{2} N (C_{6} H_{4}) {SO}_{3} H

3

C_{6} H_{5} {SO}_{3} H

4

{CHCl}_{3}

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317505 Organic compound is fused with metallic sodium for testing nitrogen, sulphur and halogens because:

1 To make the solution alkaline

2 To convert into elemental state of nitrogen, sulphur and halogens.

3 To convent covalent compound in to ionic compound.

4 To decrease fusion temperature.

Explanation:

To convert into ionic form $(NaCN, N a_{2} S, NaX)$ as organic compounds react slowly (covalent compounds).

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317478 In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with ${Fe}^{3 +}$ due to the formation of

1

NaSCN

2

[Fe(CN)_{5} NOS]^{4 -}

3

[Fe (SCN)]^{2 -}

4

{Fe}_{4} {[Fe ({CN}_{6})]}_{3} \cdot {xH}_{2} O

Explanation:

If nitrogen and sulphur both are present in an organic compound, sodium thiocyanate is formed, it gives blood red colour but not prussian blue since there are no free cyanide ions with ferric ions.
$Na + C + N + S \to NaSCN$
$F e^{+ 3} + SC N^{⊖} \to \underset{Blood red}{{[Fe (SCN)]}^{2 -}}$

NEET - 2023

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317479 In Lassaigne's test thiourea is converted into

1

NaCNS

2

{Na}_{2} S

3

NaCN

4

{Na}_{2} {SO}_{4}

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317480 Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration which confirms the presence of

1

S

and

Cl

2 N and

S

3

N

4

S

Explanation:

Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration, which confirms the presence of $N$ and S. Sodium metal (if not used in excess) in compounds containing $N$ and $S$ together forms sodium thiocyanate.
$\begin{aligned} Na + C + N + S \to \underset{Sodium thiocyanate}{NaCNS} \\ {Fe}^{3 +} + 3 {CNS}^{-} \to \underset{Blood red ppt.}{Fe (CNS)_{3}} \end{aligned}$

KCET - 2007

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317481 Which of the following compound will give blood red colour while doing the Lassaigne's test for $N$ ?

1

{({NH}_{2})}_{2} C = O

2

H_{2} N (C_{6} H_{4}) {SO}_{3} H

3

C_{6} H_{5} {SO}_{3} H

4

{CHCl}_{3}

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317505 Organic compound is fused with metallic sodium for testing nitrogen, sulphur and halogens because:

1 To make the solution alkaline

2 To convert into elemental state of nitrogen, sulphur and halogens.

3 To convent covalent compound in to ionic compound.

4 To decrease fusion temperature.

Explanation:

To convert into ionic form $(NaCN, N a_{2} S, NaX)$ as organic compounds react slowly (covalent compounds).

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317478 In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with ${Fe}^{3 +}$ due to the formation of

1

NaSCN

2

[Fe(CN)_{5} NOS]^{4 -}

3

[Fe (SCN)]^{2 -}

4

{Fe}_{4} {[Fe ({CN}_{6})]}_{3} \cdot {xH}_{2} O

Explanation:

If nitrogen and sulphur both are present in an organic compound, sodium thiocyanate is formed, it gives blood red colour but not prussian blue since there are no free cyanide ions with ferric ions.
$Na + C + N + S \to NaSCN$
$F e^{+ 3} + SC N^{⊖} \to \underset{Blood red}{{[Fe (SCN)]}^{2 -}}$

NEET - 2023

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317479 In Lassaigne's test thiourea is converted into

1

NaCNS

2

{Na}_{2} S

3

NaCN

4

{Na}_{2} {SO}_{4}

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317480 Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration which confirms the presence of

1

S

and

Cl

2 N and

S

3

N

4

S

Explanation:

Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration, which confirms the presence of $N$ and S. Sodium metal (if not used in excess) in compounds containing $N$ and $S$ together forms sodium thiocyanate.
$\begin{aligned} Na + C + N + S \to \underset{Sodium thiocyanate}{NaCNS} \\ {Fe}^{3 +} + 3 {CNS}^{-} \to \underset{Blood red ppt.}{Fe (CNS)_{3}} \end{aligned}$

KCET - 2007

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317481 Which of the following compound will give blood red colour while doing the Lassaigne's test for $N$ ?

1

{({NH}_{2})}_{2} C = O

2

H_{2} N (C_{6} H_{4}) {SO}_{3} H

3

C_{6} H_{5} {SO}_{3} H

4

{CHCl}_{3}

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