Handout: Hydrocarbons: IUPAC namesNaming Hydrocarbons(nomenclature)Drawing structures: it’s all goodCH3CHCHCH3CH3CH3CH3CHCHCH32-buteneThis is called the “condensed structure”CCCCHHHHHHHHCH3CH CH CH3On a test, choose a method that shows all HsCH3CH=CHCH3Using brackets can also shorten some formulas: CH3(CH2)4CH3vs. CH3CH2CH2CH2CH2CH3Background: formulas for HCs• Alkanes= CnH2n+2, enes= CnH2n, ynes= CnH2n-2• Remember enes, then think of what would happen if bond was single or triple instead.• Provides some useful information (e.g. for compositional analysis, or to check work)• Cannot always tell hydrocarbon type based on numbers (e.g. propyne vs. propadiene)Q - how many hydrogens in each of these:6 carbon alkaneAlkene: C22HCH3CH3Naming: common vs. IUPAC• Common names used in the 1800’s are still used for some compounds today:HCCHAcetyleneOCCH3CH3AcetoneFormic acidCOOHH
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