Question

What is the use of iso, sec & tert in IUPAC naming of organic compounds?

Answer 1

They are useful to simplify some name, like vinyl, allyl, phenyl, benzyl

instead of writing

2-(1-methylethyl)propanol

which is 2-(1-methylethyl)propanol

you write 2-isopropylpentanol

which is the same http://molview.org/?q=2-isopropylpentanol

You can do what you want, like :

http://molview.org/?q=2-isohexylundecanol

You have the prefix "neo" too, which expand the tert

http://molview.org/?q=2-neohexylundecanol