Lassaigne's test for nitrogen is negative for | vedclass

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Question

(A) Lassaigne's test is used to detect nitrogen,sulfur,and halogens in organic compounds. In this test,the organic compound is fused with metallic sod

Vedclass · Accepted Answer

$NH_2OH$ (Hydroxylamine)

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(A) Lassaigne's test is used to detect nitrogen,sulfur,and halogens in organic compounds. In this test,the organic compound is fused with metallic sodium $(Na)$. If nitrogen is present,it reacts with sodium to form sodium cyanide $(NaCN)$. However,compounds that do not contain carbon along with nitrogen,or compounds where nitrogen is present in a form that does not easily form $NaCN$ upon fusion,may give a negative result. $NH_2OH$ (Hydroxylamine) does not contain carbon. Since Lassaigne's test requires the formation of $NaCN$ (which requires both $Na$ and $C$),compounds lacking carbon cannot form cyanide ions. Therefore,$NH_2OH$ gives a negative Lassaigne's test for nitrogen.

List-$I$ (Reagent)	List-$II$ (Functional Group detected)
$A$. Sodium bicarbonate solution	$I$. Double bond/unsaturation
$B$. Neutral ferric chloride	$II$. Carboxylic acid
$C$. Ceric ammonium nitrate	$III$. Phenolic $-OH$
$D$. Alkaline $KMnO_4$	$IV$. Alcoholic $-OH$

Lassaigne's test for nitrogen is negative for which compound?

Similar Questions

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During the fusion of an organic compound with sodium metal,the nitrogen present in the organic compound is converted into:

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