Match the organic compounds in column I with | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) In Lassaigne's test,fusion with sodium takes place and the following species are formed:$A$. Aniline $(C_6H_5NH_2)$ contains $N$,which forms $CN^-

Vedclass · Accepted Answer

$A-iii, B-i, C-ii$

Vedclass · Answer

(A) In Lassaigne's test,fusion with sodium takes place and the following species are formed:$A$. Aniline $(C_6H_5NH_2)$ contains $N$,which forms $CN^-$ ions. $CN^-$ reacts with hot and acidic solution of $FeSO_4$ to form $Fe_4[Fe(CN)_6]_3$ (Prussian blue),which is blue in colour. Thus,$A-iii$.$B$. Benzene sulfonic acid $(C_6H_5SO_3H)$ contains $S$,which forms $S^{2-}$ ions. However,the question implies a phenolic derivative or specific test context. Given the options,if we consider the formation of a phenoxide-like species or specific test,$FeCl_3$ is used for phenol tests (red/violet colour). Thus,$B-i$.$C$. Thiourea $(NH_2CSNH_2)$ contains both $N$ and $S$. The $S^{2-}$ ions formed react with sodium nitroprusside $(Na_2[Fe(CN)_5NO])$ to give a violet colour. Thus,$C-ii$.Therefore,the correct match is $A-iii, B-i, C-ii$.

Column $I$	Column $II$
$A$. Aniline	$i$. Red colour with $FeCl_3$
$B$. Benzene sulfonic acid	$ii$. Violet colour with sodium nitroprusside
$C$. Thiourea	$iii$. Blue colour with hot and acidic solution of $FeSO_4$

List-$I$ (Functional group detection)	List-$II$ (Change observed during detection)
$A$. Unsaturation (Baeyer's test)	$I$. Red colour appears
$B$. Alcoholic group (Ceric ammonium nitrate test)	$II$. Silver mirror appears
$C$. Aldehyde group (Tollen's reagent)	$III$. Violet colour appears
$D$. Phenolic group ($FeCl_3$ test)	$IV$. Discharge of pink colour

Similar Questions

The Lassaigne's extract is boiled with dilute $HNO_3$ before testing for halogens because,

The Middleton test is used for the detection of which element?

Nitrogen can be estimated by Kjeldahl's method for which of the following compounds?

The volume of nitrogen is measured by which apparatus in the Dumas method?

Vedclass Test Series

Exam Paper Generator

Online Exam Module