Chapter 2 #35 and #44

[Ethan_Wilson_1E]

In chapter 2 of the Introduction to Organic Chemistry book, the answer to #35 is N-methyl-N-ethylpropan-1-amine. The answer to #44 is N-N-diethylpropanamine. Why is it that the 1 is excluded from the answer to number 44, even though both structures have two substituents and a three carbon chain?

[david_li3H]

I believe that the one is extra information aka the one could be on both molecules or none.

[Josh Ku 3H]

To my understanding, I believe that the one is just there to help you picture the molecule better. Without the one, it just implies that the amine is attached to the first carbon. I think the one comes more into use when you have multiple amine groups so you would have something like Butane-1,4-diamine, which won't be on the test. But overall, it's not wrong to put the one there so I think to be safe you could always just put it there.

Hope this helps