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The correct IUPAC name of the following compound is:

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(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?

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    $\begingroup$ There is no space between substituent prefixes and the parent structure. That's all there is to it. $\endgroup$ – orthocresol Sep 14 '19 at 12:39
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    $\begingroup$ Compare "phenyl acetate" and "phenylacetate" – two different compounds. $\endgroup$ – Faded Giant Sep 14 '19 at 12:57
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    $\begingroup$ How could putting space in the middle of a word not make a difference?! $\endgroup$ – Mithoron Sep 14 '19 at 16:27
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$\boxed{\textbf{d}}$ is correct. It is the standard IUPAC name.

However, "2,4,6-trimethyl cyclohexanone" will often be understood as 2,4,6-trimethylcyclohexanone, similar to how, in theory, neopentane, 2,2-methylpropane and 1,1,1,1-methylmethane are all equivalent.

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