2,2 - dimethylbutane : nomenclature help!

Please correct me if I am wrong:
IUPAC Name: 2,2 - dimethylbutane
- 2,2 means the location of carbon with side chains
- dimethyl represents the side chains (C-C)
- butane is the root chain of carbons (C-C-C-C)

Please answer this as well:
what does the DI in dimethyl represents?

the "di" refers to the fact that there are 2 methyl groups. a methyl group = 1 carbon chain branch.
"tri" would mean there are 3 methyl groups, and you would see something like 2,2,3-trimethylbutane

each number represents where the methyl group is located. if it says 2,2- then each methyl group is at the second carbon.

butane does indeed indicate there are 4 carbons in the root chain.

edit: the user below me is confused. there IS such a thing as 2,2-dimethylbutane. both methyls are on the same (second) carbon.

Butane has 4 carbons, the methyl groups are on the 2 and 3 carbons. You cannot name from both ends for a given compound.


There has to be a double bond between C2 and C3