Lassaigne's test is used for the detection of which the following elements?

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Halogens

Phosphorus

Nitrogen, sulphur

All of these

answer is D.

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Detailed Solution

Nitrogen, sulphur, white turbidry halogens and phosphorus present in an organic compound are detected by Lassaigne's test. The elements present in the compound are converted from covalent form to the ionic form by fusing the compound with sodium metal. Following reactions take place

$Na + C + N \overset{Δ}{⟶} NaCN$

$2 Na + S \overset{Δ}{⟶} {Na}_{2} S$

$Na + X \overset{Δ}{⟶} NaX$

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