Question

How do we name...`(H_3C)_3C-CH_2CH_2CH_2CH_2CH_3`?

Answer 1

`"2,2-dimethylheptane"`

Explanation:

`(H_3C)_3C-CH_2CH_2CH_2CH_2CH_3`

I think I've got this right. The longest chain is `7C` long, substituted at `C_2` by two methyl groups.