Chemistry - Nomenclature Question with Solution | TestHub

The longest continuous chain runs propyl - C - C - propyl: 3 + 1 + 1 + 3 = 8 carbons. The $(\mathrm{C}{\mathrm{H}}_3{)}_3\mathrm{C}$ group and the methyl and ethyl branches give shorter chains.

8 is not among (A), (B) or (C), so the answer is (D).