- TL;DR Summary
- My textbook indicates that the following figure can be named in two ways, but I do not understand how the second one is a valid name.
I understand the first one, which indicates that there is a phenyl group in the second carbon of pentane.
But where did the 2 in 2-pentylbenzene come from?
Shouldn't if it be just pentylbenzene, since there is only one subtitute(pentane) on the benzene?
If not, would you explain why?