ocr: 1989 Final Page 8 44. rhe C-C-C bond angles in isobutane ara a a E B-C-C-C- E I a à -C-H (a) 90° (b) 109.5° (c) 120° (d) either 90° or 180° (s) coatinuously changing at room cemperature 45. The syatemscic n for P2-, 94-9,4.9, C,-C, is (a) 2,4-diathylpentane (b, 3,5-dimathylbeptane (c) secoodary ethylpantane (d) 2,J-dimthyl-2,3-4iethylpropane (a) aone of thasa 46. Tha compound f (a) does aot exist, bacause carbon rings are impossible (b) is unusually stable because it is an aromatic hydrocarbon (c) is unusually reactive because its sp 3 hybrid orbitals do not overlap bead-on (d) is systematical ...
