2012 Homework 3

2012 Homework 3 -...

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Unformatted text preview: __..___________.~.-___.c_..r~.__ui_‘—w Cw ‘ CHM 255-‘Homework #3 Due Wednesday, February 1 in class Use appropriate'arrous to Show the conversion of each ion to additional contributing summers of the resonance hybrid. Most questions tell you how many additional structures are expected. 'Be sure to show all theegggected contributors and use correct arrows for each conversion to anew contributor. Note also the reguired doubleheaded arrow between resonance ' contributors. Example: Provide two additional resonance contributors to the hybrid Istructure: . (-3 _ CH2=CH——CH=CH_——CH2 Answer: m (‘6 m (e a e ACH2=CHWCH=CH-CH2 +———>~ CH =_CH-CH-£H=CH2+—> CH'z—CH=CH—CH=CH2 CAUTION-z - - n. . «a co. _ ’Do not use contributors with charge formation: (31-12::(31—1‘2 —-<—.a-- 01—12....(31—1'2 1. Provide one additional resonance contributor to the hybrid structure: - ~ ' ' ® ,- +-—~cl-€ CHfCH—CHZ {Zr—>- __ C K2, C’J’ ” a. . ' . 2. Provide one additional resonance contributor to the hybrid structure: A. O _ u I . cur—omens, 4—4-7? ca _H-z_~ G -" C’ “is 3. Provide gm additional resonance contributors to the hybrid structure: 94/1,? ' efl/‘E? CHz—CH=CH—C—CH3<—\—;> 3352;: c +£—~cl~é ~ GEE 4. Show the primary contfibu‘ting structuro(s) for the resonance hybrid correspOnding to: h 69 “e @ @ CH3O—CHwCH2—O—CH2 é—-——->:> (Llaéco 29- “L (1263 OWE 5. How many atoms bear a partial negative charge in the following struetme? Show your World! 9 0 @CE I . fig... (answer) Your work here: ' fl ' U ._ 69 a; efi :— jfiflécf’d d534,, H... H k/J T v G). E? #27" A/ , Q ' 6. Use 5+, 3" and dotted lines to show the structure of the resonance‘hybfid corresponding to: (9 C [’LZ~ CZ. Hz $2' I] Q AI ...
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2012 Homework 3 -...

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