# Are ortho, meta and para used in IUPAC nomenclature?

I was presented with the following question in an online test:

To avoid any confusion, here are the arranged options:

A. 2-Chlorotoluene
B. 1-Chloro-2-methylbenzene
C. B and D
D. O-Chlorotoluene

Correct answer: (C) B and D.
Explanation: Chloro is given priority so numbered as 1

My question is: Are the ortho, meta and para prefixes part of the official IUPAC nomenclature or not?

I chose B, what should be the correct answer to this question?

• .. if taking typography into account, all names in the image are wrong. Jul 20 '18 at 17:04
• @mykhal: No, options b and c (in the image) are correct. Jul 20 '18 at 17:17