If you care about who is factually correct, then it's person 2 and 4:

Palmitic acid (hexadecanoic acid in IUPAC nomenclature) is a fatty acid with a 16-carbon chain. It is the most common saturated fatty acid found in animals, plants and microorganisms.

(Although person 3 is correct in that it is a carboxylic acid. It doesn't exclude the other terms though.)

When you realise to late, that it was a question

O oh

its 2024. nobody cares about facts anymore...

This kind of stuff used to be really funny on old Tumblr because you'd find these hyper-niche arguments between a bunch of drunk biologists in the middle of scrolling through the vast sea of porn. 2 posts down would be furry porn followed by a 1,000 word Obama x Dr. Who fanfic or some shit.