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15.16 a) TT -> at 252 nm and n at 325 nm b) TT c) n d) TT 15.17 a) 2-Butanone will show an absorption maximum for its n -> transition in this region. b) The TT transition of 1,3-pentadiene does not occur in the accessible UV region because it is not conjugated. c) 1,3-Cyclohexadiene has conjugated double bonds, so its TT transition will occur in this region. d) Propylbenzene has an aromatic ring, so a TT transition will occur in this region. e) Naphthalene has two fused aromatic rings, so a TT -> TT* transition will occur in this region. f) Diethyl ether will not show an absorption in this region. g) Cyclopentanol will not show an absorption in this region. h) 2-Cyclohexenone will show absorption maxima for TT and n - transitions in this region. 15.18 a) + + . m/z 86 m/z 57 + CH₃CH₂CH₂CH₂ + CH₂CH₃ m/z 29 + CH₃CH₂CH₂ + m/z 43 CH₃ CH₃ b) + CH₂CH₃ + m/z 100 m/z 71 CH₃ + CH₃ + + CH₃CH₂CH₂ CH₃CH₂CH m/z 29 + m/z 43 + m/z 57 CH₃ CH₃CH₂CH CH₃CH₂CH₂ 229