q3pf09key - 4. Which of the following molecules is/are...

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CH301 Fall 2009 Practice Quiz 3 Answer Key 1. Which of the bonds below could be found in a non-polar molecule? I. C=C II. H-F III. B-Cl 1. I 2. II 3. III 4. I and II 5. I and III 6. II and III 7. I, II and III A C=C bond could be found in any symmetrical molecule (e.g. C 2 H 4 ), which would be non-polar. An H-F bond could only be found in the molecule H-F because both species can form only a single bond. A B-Cl bond could be found in a symmetrical molecule (e.g. BCl 3 ) and so could be found in a non-polar molecule. 2. Consider the molecule below; how many different hybridizations are required to describe all of its central atoms? (Note: the non-bonding electrons are omitted) 1. 1 2. 2 3. 3 4. 4 5. 5 The central atoms, from left to right, have hybridizations of sp , sp , sp 3 , sp 3 , sp 2 , sp 2 . 3. Which of the following does not have a pyramidal molecular geometry? 1. IOF 3 2. XeCl 4 3. PH 3 4. AsI 5 The molecule IOF3 would have a see-saw geometry because its lone pair would go into the equatorial position.
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Unformatted text preview: 4. Which of the following molecules is/are polar? I. SO 2 II. O 3 III. CH 2 F 2 1. I 2. II 3. III 4. I and II 5. I and III 6. II and III 7. I, II and III SO 2 has polar bonds and an asymmetrical molecular geometry and is therefore polar. O 3 is a famous exception to the simple guidelines for molecular polarity and is polar in spite of having only non-polar bonds. CH 2 F 2 is asymmetrical and thus its dipoles do not cancel - it is polar. 5. Which of the compounds below would have the greatest number of pi bonds? 1. XeO 3 2. CH 3 NHCHCCH 3. C(NH 2 ) 4 4. HSCN 5. SO 2 Xenon tetroxide would have 3 pi bonds, all of the other choices have 2 or less. 6. Which of the molecules below will contain a sp2,sp3 bond? 1. SiH 3 CHCHCH 3 2. CH 3 PHCH 3 3. CF 3 CBr 3 4. CH 2 SF 2...
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q3pf09key - 4. Which of the following molecules is/are...

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