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PS11 - σ b 2s 2 and its bond order i When n> 2 only one...

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1 Chemistry 2090 Problem Set #11 Due Monday (in class), April 18, 2011 Chap 11 Problems: 7, 8, 18, 24, 34, 38, 44, 59, 69 F4. In the MO diagrams below, the energy scale of A ( E ) is different from that of B ( E' ), and the orbitals are σ b , σ *, π b or π *. X-X' z ns ns np np 1 3 2 4 5 6 A X-X' z ns ns np np 7 9 8 11 12 B 10 E E' Note that the filled (n-1) orbitals of X and X' are too low in energy to interact and are not shown. a. Sketch orbital 2, and state whether it is σ b , σ *, π b or π *. b. Sketch orbital 4, state whether it is σ b , σ *, π b or π *. c. Sketch one of the orbitals labeled 10, state whether it is σ b , σ *, π b or π *. d. Sketch orbital 12, state whether it is σ b , σ *, π b or π *. e. For what diatomics (X = X' = B,C,N,O,F,Ne) does MO diagram B apply? f. Explain why orbitals 3 are below orbitals 4 in A and orbitals 10 is above orbital 9 in B . g. What is the bond order of OF + ? h. CB - is thought to be diamagnetic. Give its electron configuration (e.g.,
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Unformatted text preview: σ b 2s 2 ..... ) and its bond order i. When n > 2, only one of the two diagrams above applies for appropriate homonuclear diatomics. Which one applies, and provide a rationalization. j. In the molecule below, indicate which carbons are sp 3-hybridized with the letter a , the sp 2 carbons with the letter b , and the sp-hybridized carbons with the letter c . NH 2 k. Consider the acetone molecule shown below. 2 O C CH 3 H 3 C i. Sketch the linear combination of orbitals (if you choose hybrid orbitals, make sure they look like hybrids; linear combination means φ a ± φ b , for example) that constitutes the C-O sigma bond in acetone. ii. Sketch the linear combination of orbitals that constitutes the C-O pi bond in acetone....
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