JEE Main 2015 · 11 Apr · Shift 1 · Chemistry Q51 · Dronacharya Exams

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ChemistryList match+4 / -1Question 51 of 90

Match the organic compounds in column - I with the Lassaigne's test results in column - II appropriately :

Column - I

A
Aniline
B
Benzene sulfonic acid
C
Thiourea

Column - II

i
Red color with $\ce{FeCl3}$
ii
Violet color with sodium nitroprusside
iii
Blue color with hot and acidic solution of $\ce{FeSO4}$

A

(A) - (ii) ; (B) - (i) ; (C) - (iii)

B

(A) - (iii) ; (B) - (ii) ; (C) - (i)

C

(A) - (ii) ; (B) - (iii) ; (C) - (i)

D

(A) - (iii) ; (B) - (i) ; (C) - (ii)

Answer and worked solution

Official answer: B

Aniline contains N only: Prussian blue with $\ce{FeSO4}$ , (A) → (iii).
Benzenesulphonic acid contains S only: violet with nitroprusside, (B) → (ii).
Thiourea contains N and S: blood red $\ce{Fe(SCN)}$ with $\ce{FeCl3}$ , (C) → (i).

Topics:Qualitative and quantitative analysis of organic compounds

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