Question

Ethyl chloride on heating with silver cyanide forms a compound X. The functional isomer of X is:
A.${C_2}{H_5}CN$
B.${C_2}{H_5}NC$
C.$C{H_3} - NH - C{H_3}$
D.${C_2}{H_5}N{H_2}$

Answer 1

Hint: Isocyanide (also known as isonitrile or carbylamine) is an organic molecule containing the functional group -NC. The prefix is isocyano because it is an isomer of the related nitrile (-CN). The nitrogen atom, not the carbon, connects the organic fragment to the isocyanide group. They are employed in the production of other chemicals as building blocks.

Complete answer:
The chemical molecule $AgCN$ stands for silver cyanide. It's a white solid that forms when Ag+-containing solutions are treated with cyanide, which is used to recover silver from solution in some systems. In silver plating, silver cyanide is employed. Chloroethane, or ethyl chloride, is a chemical compound having the formula\[C{H_3}C{H_2}Cl\] that was previously frequently used to make tetraethyllead, a gasoline additive. It's a colourless, combustible gas or liquid that has a mildly sweet odour.
${C_2}{H_5}Cl + AgCN\xrightarrow{\Delta }{C_2}{H_5}NC + AgCl$
Because the connection between silver and carbon is partially covalent, the functional group in this reaction is isocyanide. As a result, the nucleophile attacking side is nitrogen, and AgCl is easily precipitated from the solution.
Isocyanide ${C_2}{H_5}NC$ functional isomer is cyanide ${C_2}{H_5}CN$.
Hence option A is correct.

Note:
“Functional isomers are structural isomers with the same chemical formula (that is, the same number of atoms of the same elements) but distinct groupings because the atoms are linked in different ways. These atom groupings are referred to as functional groups or functionalities.”