# Does space in between have any significance in IUPAC nomenclature?

The correct IUPAC name of the following compound is:

(a) 2,4,6-trimethyl cyclohexanone
(b) 1,3,5- trimethyl benzophenone
(c) trimethylcyclobutanone
(d) 2,4,6-trimethylcyclohexanone

I was confused between option (a) and (d). I opted for option (a), but our teacher told that ans is an option (d). The only difference I see between these two options is that there is space in (a). Does space have any significance in IUPAC nomenclature?

• There is no space between substituent prefixes and the parent structure. That's all there is to it. – orthocresol Sep 14 '19 at 12:39
• Compare "phenyl acetate" and "phenylacetate" – two different compounds. – Faded Giant Sep 14 '19 at 12:57
• How could putting space in the middle of a word not make a difference?! – Mithoron Sep 14 '19 at 16:27

$$\boxed{\textbf{d}}$$ is correct. It is the standard IUPAC name.