Consider the Lewis structure for ammonia, NH3. How many structural electron pairs are found on the central atom? H-N-H H.

1. Molecule A, shown below is closely related to the drug NGD-4715, which exhibits anti- depressant effects in animal models. Which of the following best describes the orbital overlap between the C and N atoms that provides the G-bond in the cyano group (labelled "e")? (A) C sp - N sp (D) Cp-Np OA OB OC OD OH (B) C sp'-N p (E) C sp - N sp¹ Molecule A (C) C sp - N sp

determine the molecular structure based on the spectroscopic data in the picture explain for each picture

The molecular orbital diagram of NO shown in Figure 10.47 also applies to the following species. Write the molecular orbital electron configuration of each, indicating the bond order and the number of unpaired electrons. (a) LiBe+ (b) CO+ (c) CN (d) OF Figure 10.47 Molecular orbital diagram for nitric oxide (NO). The molecular orbital diagram for NO predicts a bond order of 2.5 and predicts that the molecule is paramagnetic with one unpaired electron. These predictions are verified by experimental measurements.

Draw an orbital picture of thiazole. Assume that both the nitrogen and sulfur atoms are sp2-hybridized, and show the orbitals that the lone pairs occupy.

Consider any one of the four identical hybrid orbitals in the 109.5° set. a. What fraction of the clay in this hybrid orbital was originally red (carne from the 2s orbital)? b. What fraction of the clay in this hybrid orbital was originally green (carne from a 2porbital)? c. Explain the name “ s(1/4)p(3/4) hybrid orbital” for each of the four orbitals. d. In fact, each of the four hybrid orbitals in the 109.5° set is called an sp3 -hybrid orbital.Explain the name “ sp3 -hybrid orbital.”

Which compound in each of the following pairs would you expect to have the greater dipole moment u? Why? (a) HF or HCI (b) HF or BF3 (c) (CH3); CH or (CH3)3CCI (d) CHCI3 or CCl;F (e) CH3 NH2 or CH3 OH (f) CH3 NH2 or CH3 NO2

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On one-electron oxidation of a five valence electron AH₂ compound (C₂, point group) to a closed shell (no unpaired electrons) four valence electron C₂, cationic species, what is the symmetry of the highest energy occupied molecular orbital, and what happens to the energy of this orbital when the four valence electron AH2 C2y cation changes to a Doch geometry? O 2a₁ and stabilised (decreases in energy) O 2a₁ and destabilised (increases in energy) O 1b2 and stabilised (decreases in energy) O b₁ and no change in energy