L2A - Last lecture: CH101 review Lewis structures formal...

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1 1 Last lecture: •Lewis structures •formal charges •hybridization •bonding CH221 CH101 review ©Dr. Kay Sandberg •constitutional isomers •condensed structures •skeletal structures •functional groups •alkanes 2 This lecture: ©Dr. Kay Sandberg 1) Classify hydrocarbon groups 2) Alkane nomenclature 1) # of C in constitutional isomer of butane? 2) # of C in ethane? 3) # of C in propane? 4) # of C in methane? 3 methyl group CH 3 - methane C H H H H C H H C HH H H C H H C HC H H H H H ethane propane methylene group -CH 2 - Section 2.8 ©Dr. Kay Sandberg 4 methyl group CH 3 - C H H C H CCH H H H H H H Butane ( C 4 H 10 ) Section 2.8 C H H C H H C H H H H H methine group -CH- n -butane isobutane normal (no branching) constitutional isomers ©Dr. Kay Sandberg methylene group 2 - (CH 3 ) 3 CH CH 3 CH 2 CH 2 CH 3 5 Higher -alkanes ( C n H 2n+2 ) Section 2.6 C H H C H CCC H H H H H H H H H C H H C C H H CC H H H H H H H -pentane -hexane Condensed structural formula CH 3 CH 2 CH 2 CH 2 CH 3 CH 3 (CH 2 ) 4 CH 3 ©Dr. Kay Sandberg CH 3 (CH 2 ) 3 CH
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L2A - Last lecture: CH101 review Lewis structures formal...

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