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Question

An organic compound containing nitrogen, sulphur, and oxygen as extra elements is fused with metallic sodium and then extracted with distilled water.
Which of the following species is/are present in the Lassaigne’s extract?

A
NO3
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B
CN
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C
[SCN]
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D
S2
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Solution

The correct option is D S2
Given, the organic compound has C,H,N,S and O
In Lassaigne's test, the elements present in a compound are converted from covalent to ionic form by fusing the organic compound with Sodium (Na) metal because ionic forms are more reactive.
Thus, carbon and nitrogen will form cyanide ion and Na2S will be formed from sulphide ion.
Since, both nitrogen and sulphur are present in the organic compound, sodium thiocyanate is formed.
Na+C+NΔNaCN2Na+SΔNa2SNa+C+N+SΔNaSCN

Cyanides, sulphides and thiocyanate of sodium formed on sodium fusion are extracted from the fused mass by boiling with water.
This extract is known as Sodium Fusion Extract (Lassaigne Extract).
Thus, NO3 is not present in the Lassaigne's Extract.
Therefore, the correct options are (b), (c) and (d).

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