Question

IUPAC name of the given compound is:

Answer 1

The nomenclature of organic chemical compounds is governed by the International union of pure and applied chemistry. A compound should have a name such that the structural formula of a chemical compound can be determined from it.

Complete step-by-step answer: The compound can be redrawn as

The IUPAC name of the given compound can be determined by the following steps
1. Find out the parent hydrocarbon chain. The parent chain must be the longest and have the maximum number of substituents of the suffix functional group. When there is a presence of multiple functional groups, the suffix functional group with the highest precedence is included in the carbon chain. Also, the parent chain should have the maximum number of double bonds as well as single bonds.

Here the parent carbon chain is 4 carbon chains (butan-) containing the functional group.
2. Identify the functional group.
Here the functional group is an amide.
3. Identify the side chains.
Here there is one side methyl chain.
4. Identification of remaining functional groups.
Here there are no other functional groups.
5. identification of unsaturated bonds.
Here there are no unsaturated bonds.
6. Numbering the chain
The chain is numbered such that the suffix functional group has the lowest value. The unsaturated bonds and the functional groups present must also have the least possible value.
Hence the chain will be numbered from right-to-left.

6. When there are multiple substituents of the same type, prefixes like di-, tri-, are added.
7. Name the compound

So, the IUPAC name of the compound ${{C}_{15}}{{H}_{11}}NO$ is 2-methylbutanamide.

Note: It should be noted that while IUPAC nomenclature can help determine the structural formula of a compound, for complex molecules, they are tedious and long and hence are avoided in normal conversation. Simple and common names are used instead.