(Solved): What is the correct IUPAC name for the following molecule: 2-ethyl-2,6-dimethylheptane 1,1,5,5-tetr ...

What is the correct IUPAC name for the following molecule: 2-ethyl-2,6-dimethylheptane 1,1,5,5-tetramethylhexane 1,1,5,5-tetramethylheptane 2,6,6-trimethyloctane 4,4-dimethyl-1-isopropylhexane Which one of the following structures must be incorrect? (ie: which structure is wrong?)