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Physical Properties of Organic Compounds Chem 11 Saturated vs Unsaturated: Saturated hydrocarbons or saturated fatty acids have all single bonds between carbon atoms Unsaturated hydrocarbons or fatty acids have one or more double bonds between carbon atoms monounsaturated - one double bond polyunsaturated - more than one double bond Alkanes: Saturated Non-polar Not soluble in H2O Intermolecular forces weak, thus alkanes have relatively low boiling points As the number of atoms increase, the boiling point increases Note: table is alphabetical! Alkenes: Unsaturated Unsaturated C atoms can potentially bond to additional atoms! Thus are more reactive. Boiling points of alkenes are generally lower then similar (same # C) alkanes, reflecting slightly lower IM forces Ex: ethane -89ºC and ethene -104ºC Alkynes: Similar physical properties to alkanes and alkenes (non-polar, not soluble in water, etc.) Boiling points of alkynes are generally slightly higher then similar (same # C) alkanes and alkenes Reactivity: Predict which is most reactive: alkanes, alkenes or alkynes Reactivity Alkynes > alkenes > alkanes The presence of the triple bond makes alkynes even more reactive than alkenes. In fact, alkynes are so reactive that few of these compounds occur naturally. Alcohols: OH bond is highly polar and creates H bonding between molecules Polarity makes them highly soluble in water Higher boiling points then alkanes with the same number of carbons Ethers: Bent shape around the O atom, dipoles don’t cancel and molecules are polar Usually soluble in water Lower boiling point then alcohols of the same number of carbons Aldehydes and Ketones: C=O bond is polar, so molecules usually are as well Smaller soluble in water, larger molecules not Smelly! Lower boiling points than corresponding alcohols but higher then corresponding alkanes