Question

The isomer present in cyanide and isocyanide is:
A.Functional
B.Position
C.Metamerism
D.tautomerism

Answer 1

Cyanide and isocyanide have the same molecular formula but differ in function group due to the attachment of different groups with the main chain.

Complete step by step solution:
The bonding in between C and N is $\cdot {\text{C}} \equiv {\text{N:}}$ , both carbon and nitrogen have unbounded electrons and hence the attachment can occur through either of them.
The cyanide functional group is $- {\text{CN}}$. That is the linking site for cyanide is carbon atom. The isocyanide functional group is $- {\text{NC}}$ here the attachment occurs through nitrogen.
This gives rise to functional isomerism. A functional isomer is that which has the same molecular formula but is attached in different ways that gives rise to different functional groups.

The correct option is A.

Additional information:
When chemical compounds have similar chemical formulas but have different properties and arrangement of atoms then they are known as isomers. It is derived from the Greek word in which Iso means same and mers means parts.
There are two types of isomerism, structural isomerism and stereoisomerism. Structural isomers are further classified as chain isomers, positional isomers, functional isomers, metamerism, tautomerism, and ring chain isomerism. The stereoisomers are further classified as geometrical isomerism and optical isomerism.

Note: Metamerism or metamers are the type of isomers that happen due to the presence of different alkyl chains on each side of the functional group. Tautomerism exists when the position of protons and electrons change. The most important tautomerism is keto enol tautomerism. Positional isomerism is that isomerism in which the compound varies in the position of functional group.