Question

Match the compounds in Column I with their charecteristic test(s)/reaction(s) given in Column II.

Column I	Column II
(A)	(p) Sodium fusion extract of the compound gives prussian blue colour with $FeS{O}_4$
(B)	(q) Gives positive $FeC{l}_3$ test
(C)	(r) Gives white precipitate with $AgN{O}_3$
(D)	(s) Reacts with aldehydes to form hydrazone derivatives

• A. $\left(A\right)\to r,s;\left(B\right)\to p,q;\left(C\right)\to p,q,r;\left(D\right)\to p,s$
• B. $\left(A\right)\to p,s;\left(B\right)\to p,q,r;\left(C\right)\to p,q;\left(D\right)\to r,s$
• C. $\left(A\right)\to p,q,s;\left(B\right)\to p,r,s;\left(C\right)\to p;\left(D\right)\to q,s$
• D. $\left(A\right)\to p,r;\left(B\right)\to q,s;\left(C\right)\to q;\left(D\right)\to s$

Answer 1

The correct option is A $\left(A\right)\to r,s;\left(B\right)\to p,q;\left(C\right)\to p,q,r;\left(D\right)\to p,s$

$\left(A\right)\to (r,s),\left(B\right)\to (p,q),\left(C\right)\to (p,q,r),\left(D\right)\to (p,s)$

Sodium fusion extract of the compound containing $C,N$ gives prussian blue colour with $FeS{O}_4.$ This is the detection of element $C$ and $N$ by Lassaigne's method.

Phenolic groups form coloured iron complex when treated with neutral $FeC{l}_3$ solution. The formation of the iron complex is attributed to the existance of keto-enol tautomerism in phenol. Phenol predominantly exists in enolic form, hence colour formation is used to identify phenol.

In (A) and (C), terminal chloride ion is capable of forming white precipate of $AgCl$ with $AgN{O}_3.$

Hydrazine reacts with aldehydes or ketones to give hydrazone. Similarly, aldehydes or ketones give 2,4-dinitrophenyl hydrazone with 2,4-dinitrophenyl hydrazine compound.