Question

How do aliphatic aldehydes differ from aromatic aldehydes?

Answer 1

Difference between aromatic aldehydes and aliphatic aldehydes:

Aromatic aldehydes	Aliphatic aldehydes
The compounds in which the aldehyde functional group is attached to the aromatic ring are known as aromatic aldehydes. Aromatic rings are planar, conjugated, and contain $(4\mathrm{n}+2)\mathrm{\pi }$ electrons.	The compounds in which the aldehyde functional group is attached to the aliphatic chain are known as aliphatic aldehydes. Aliphatic chains are saturated compounds.
Aromatic aldehydes attain stability due to resonance.	Resonance does not occur in aliphatic aldehydes as they do not contain a conjugated system.
Aromatic aldehydes are less reactive due to their stability.	Aliphatic aldehydes are more reactive than aromatic aldehydes.
They have a sweet pleasant odour.	Aliphatic aldehydes are mostly odourless.
There is delocalization of electrons in aromatic aldehydes takes place.	No delocalization of electrons is seen in aliphatic aldehydes.
Examples of aromatic aldehydes: Benzaldehyde, Salicylaldehyde, etc. Structure of Benzaldehyde Structure of Salicylaldehyde	Examples of aliphatic aldehydes: Formaldehyde, acetaldehyde, etc. Structure of Formaldehyde Structure of Acetaldehyde