The suffix used for naming an aldehyde is:

(A) -ol

(B) -al

(C) -one

(D) -ene

Functional groups are specific groups of atoms within a molecule that determine its characteristic chemical properties, regardless of the rest of the structure. Common examples include amines, alcohols, carboxylic acids, and ketones.

Aldehydes are a class of compounds that contain a terminal carbonyl group (-CHO). In the order of functional group priority, aldehydes come just after carboxylic acids.

For example, consider the compound Ethanal:

• The root word is ethane.
• To indicate the aldehyde group, the suffix “-al” is added.

Therefore, the suffix used for aldehydes is “-al”, as per the rules set by the International Union of Pure and Applied Chemistry (IUPAC).

Additional Information:

The IUPAC (International Union of Pure and Applied Chemistry) is a global federation of National Adhering Organizations, representing chemists worldwide. It is registered in Zürich, Switzerland, and its administrative office is known as the IUPAC Secretariat.