Which of the following statements is not applicable to Lassaigne's test?

The extra elements (N, S and halogens) are tested as their inorganic salts.

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During fusion of the organic compound iwth sodium,

N a_{2} S, N a C N

and

N a X

are formed.

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It can even be used for the detection of hydrogen in the organic compound.

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It is possible to differentiate between the different halogens.

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Solution

The correct option is C It can even be used for the detection of hydrogen in the organic compound.
Lassaignes test
$N a + C + N a \to N a C N$
$2 N a + S \to N a_{2} S$
$N a + X \to N a_{2} S$
Option (a) is correct
when sulphur is also present
$N a + C + N + S \to N a C N S$
$3 C N S^{-} + F e^{3 +} \to F e (C N S)_{3} Blood red$
$N a S C N + 2 N a \to N a C N + N a_{2} S$
option (b) is correct
For testing halogens
$A s N O_{3} + N a X \to A g X ↓ + N a N O_{3}$
when X = Cl
$A g C l$ (white ppt) soluble in $N H_{4} O H$
When X = I
$A g I$ (Dark-yellow ppt) is soluble in $N H_{4} O H$
option (d) is correct.
It can't be used for the detection of hydrogen in the organic compounds. Method for the detection of C and H is known as Liebig's Method

So the answer is the option (c).

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