(A) 2,4-dimethylpentane (B) 2,4-dimethylhexane
(C) 2,4,6-trimethylheptane (D) 3-ethyl-2-methylpentane
(E) 2,3-dimethylpentane (F) 2,2-dimethylhexane
(G) 2,5-dimethylhexane (H) 4-methylheptane
(I) 3-ethyl-1,1,2,2-tetramethylcyclopentane (J) 1,1-dimethylcyclohexane
(K) 2-ethyl-1,1,3,3-tetramethylcyclopentane (L) 2,3-dimethylbutane
