Question

Write the IUPAC name of the following:

Answer 1

The IUPAC naming which associates the aldehyde group in the molecule have some special notified methods. The identification is the most vital step while naming the compound.

Complete step by step solution:
Let us understand the IUPAC culture of naming the compounds on some terms and conditions.
IUPAC-
A systematic method of naming organic compounds is recommended by the International Union of Pure and Applied Chemistry which is known as IUPAC nomenclature.
The steps for naming any compound is as follows;
1. Identification of basic parent chain to which the substitutes are attached.
2. Parent functional group identification.
3. Other functional groups are identified.
4. See whether the compound has a single, double or triple bond in it.
5. Side chains attached to the parent chain are recognised and numbering is done.
Our given data focuses on the aldehyde group, so let’s see about the aldehyde functional group.
Aldehydes are named by replacing the suffix -ane by -anal.
Presence of more than one aldehyde group results in addition in suffix i.e. -anedial for 2 groups.
That’s not necessary to put the number to indicate the aldehyde group as it would always be at the end of the chain and would be assigned as C-1.
Thus, for given two compounds the IUPAC names can be given with the help of above-mentioned rules;

IUPAC name of

is Ethanedial as it consists of 2 carbon atoms which are aldehyde groups in themselves.
Whereas, IUPAC name of

is 2-phenylacetaldehyde as the parent chain consists of the phenyl group and at the second position aldehyde group is attached.

Note: Note that there are many names given to a single compound during its nomenclature and priorities. But we should always study and use the preferred IUPAC name of any of the compounds.