Final answer:
The statement about aldehydes containing a -CHO functional group on a terminal carbon is true. Aldehydes have a carbonyl carbon atom bonded to at least one hydrogen atom and are located at the end of the carbon chain, differentiating them from ketones.
Step-by-step explanation:
The statement that aldehydes are organic substances that contain a -CHO functional group on a terminal carbon is true. An aldehyde has at least one hydrogen atom attached to the carbonyl carbon atom, which is the carbon atom connected by a double bond to an oxygen atom. The simplest form of an aldehyde is formaldehyde, where the carbonyl carbon atom is bonded to two hydrogen atoms (HCHO). In general, aldehydes may be represented as RCHO, where R represents a hydrocarbon chain or a hydrogen atom and the carbonyl carbon is at the end of the chain, distinguishing it from ketones, which have the carbonyl carbon within the chain.