(a) What do you understand by functional isomerism? Give an example

(a) What do you understand by functional isomerism? Give an example.
(b) Why is an organic compound fused with sodium in Lassaigne’s test ?
© What is the Prussian blue coloured compound formed in the Lassaigne’s test for confirming the presence of nitrogen in the organic com-pound?

(a) Functional isomerism : These isomers have same molecular formula but different functional group.

(b) Fusion of organic compound with sodium
metal convert elements present in organic compound into ionic compound that can be easily detected.
© It is Iron (II) hexacyanoferrate (II),