110_Fa11_LUZ-PracticeExamples_10_3 (1)

110_Fa11_LUZ-PracticeExamples_10_3 (1) - 2 CH 3 for 3 is CH...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
The chemical structure of a molecule (pentacene) resolved by atomic force microscopy Leo Gross of IBM Research in Switzerland, and coworkers, Science 2009, 325, 1110 What is the molecular formula of pentacene? C 22 H 14 What is the hybridization of the carbon atoms? Pentacene has resonance structures (delocalized ! bonding), so all C atoms are sp 2 hybridized. Practice Example 1. Which of the following molecules are geometric isomers? A. There are no geometric isomers. B. 1 and 2 C. 1, 2 and 3 D. 3 and 4 E. They are all geometric isomers of each other. Solve: The molecular formula for all four molecules is C 4 H 7 F, but the condensed molecular formula for 1 is CHF=CHCH 2 CH 3 , for 2 is CHF=CHCH
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 2 CH 3 , for 3 is CH 2 =CFCH 2 CH 3 , and for 4 is CH 3 CH=CFCH3. Geometric isomers have the same molecular formula, same structural connectivity (same condensed molecular formula), but different geometric arrangement. So 1 and 2 are geometric isomers, and the correct answer is B . Practice Example Which of the following molecules will undergo an addition reaction with Br2? I. Heptane II. Pentene III. Toluene IV. Butyne A. I B. II, III C. II, III, IV D. II, IV E. all of them Solve: As shown in demo during class, alkenes and alkynes will react with Br 2 , but alkanes and aromatic hydrocarbons won’t. So the correct answer is D ....
View Full Document

This note was uploaded on 01/18/2012 for the course CHEM 110 taught by Professor Hofmann,brucerob during the Fall '08 term at Penn State.

Page1 / 2

110_Fa11_LUZ-PracticeExamples_10_3 (1) - 2 CH 3 for 3 is CH...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online