40 choose all the constitutional isomers of gaba a b

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Unformatted text preview: nd B are true. D. Neither A or B is true. 39 D. Neither A or B is true. 40 Choose all the constitutional isomers of GABA. A. B. C. O H2N OH H2N Only compound 1. Only compound 2 Only compound 3 O OH H2 N D. E. F. Only compounds 1 and 2. Only compounds 1 and 3. None of these is a constitutional isomers of GABA. O OH O HO NH 2 energy O H2N OH ? OH H2 N O ? O HO NH 2 C4H9NO2 1 C4H7NO2 2 C4H9NO2 GABA C4H9NO2 3 C4H9NO2 C4H9NO2 GABA C4H9NO2 Constitutional isomers are structures with the same molecular formula but different connectivities. connectivities. 41 Constitutional isomers are structures with the same molecular formula but different connectivities. connectivities. 42 7 9/5/2008 Choose the true statements about the following structures. Constitutional isomers are structures with the same molecular formula but different connectivities. connectivities. O H H 2N O H H2N O O H H 2N O H H2N O H2N 1 O 2 O GABA 3 O H H2N 1 O 2 O 3 O H A. Structures 1 and 3 are constitutional isomers of GABA. B. Only 3 is a constitutional isomer of GABA. C. Structures 1 and 3 are constitutional isomers. D. Structures 1 and 3 are not constitutional isomers of GABA. 43 A. Structures 1 and 3 are constitutional isomers of GABA. B. Only 3 is a constitutional isomer of GABA. C. Structures 1 and 3 are constitutional isomers. D. Structures 1 and 3 are not constitutional isomers of GABA. 44 GABA (gamma aminobutyric acid), an important neurotransmitter. These structures have different shapes. They are different conformations of GABA (chapter 4) O H H 2N O H H2N O GABA (gamma aminobutyric acid), an important neurotransmitter. These structures have different shapes. They are different conformations of GABA (chapter 4) O H H 2N O H H2N O H2N 1 O 2 O 3 O H H2N 1 O 2 O 3 O H GABA receptor Predict the correct shape for the carboxyl group. trigonal pyramidal trigonal planar O O How do we predict the best molecular shapes? Valence Shell Electron Pair Repulsion theory VSEPR: Electron pairs assume a geometry that minimizes their repulsion. trigonal p...
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