Incorrect Pearson Answer?

[newtofu]

I need some reassurance for this question on the 2nd pearson exam.

The answer key says it's supposed to be named:
1-isopropyl-3-methylcyclohexane

But shouldn't we prioritize the Meth before the Prop for abc order and name it as so?
1-methyl-3-isopropylcyclohexane

Thanks for looking!

 

[needsomehelpnow]

I need some reassurance for this question on the 2nd pearson exam.

The answer key says it's supposed to be named:
1-isopropyl-3-methylcyclohexane

But shouldn't we prioritize the Meth before the Prop for abc order and name it as so?
1-methyl-3-isopropylcyclohexane

Thanks for looking!

I think you should compare with "I"soprop- and "M"ethyl. isopropyl is a common name so you should not ignore iso-. I think you can only ignore di-, tri-, tetra-, etc.

Anyone please, correct me if I'm wrong.

+

http://www.adichemistry.com/organic...nomenclature.html#rule-first-point-difference

I found this, here it says sec-, tert- is ignored too, only iso- should be considered as i.

 

[doctortp]

you are correct. only the actual name not the numerical value as you would say (di, tri, 2, 3 of the methyl or ethyl group) isopropyl is name of the group itself not to represent how many of the group

 

[sphuan2]

also i think the actual explanation to this problem says that isopropyl is the principal functional group and therefore the starting point.

 

[newtofu]

Thanks guys!