Question

Column I		Column II
A		p	Sodium fusion extract of the compound gives Prussian blue colour with $FeSO _4$
B		q	Sodium fusion extract of the compound gives blood red colour with $FeSO _4$
C		r	Lassaigne's extract (L.E.) in $CS _2$ and $Cl _2$ water gives orange colour
D		s	L.E. with $\left[ Fe ( CN )_5 NO \right]^{2-}$ gives violet colour

• A. A= s ,B= p ,C= r ,D= q,r
• B. A= r ,B=s ,C=q,r ,D= p
• C. A= p ,B=r ,C=q ,D= s
• D. A= q,r ,B=q,C= s ,D= r

Answer 1

Answer: (B)

$( a \rightarrow r )$ Diazonium salts do not give positive test for $N$, because on heating they decompose before combining with Na to form $CN ^{\ominus}$ ion, which is a necessary condition for $n$ - test
On the other hand, it gives the test for $Br ^{\ominus}$ ion (organic layer test)
(b $\rightarrow s$ ) It contains $C$ and $S$, so it gives nitroprusside test. $\left[ Fe ( CN )_5 NO \right]^{-2}$, is nitrorpuside ion
$( c \rightarrow q , r )$ It contain $C$ and $N$, so it gives (positive) test for $N$ and the test for $Br ^{\ominus}$
$( d \rightarrow p )$ It contains $C$ and $N$, so it gives positive test for $N$ and also gives test for $I ^{\ominus}$ (but that is not given in the equation)