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Chapter 2: Structure and Properties of Organic Molecules
Chapter 2: Structure and Properties of Organic Molecules

... only of carbon and hydrogen. They include: – alkanes (saturated hydrocarbons) – alkenes (double bond) – alkynes (triple bond) – Aromatics (double and single bonds in conjugation) ...
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... - the electron pair is shared almost equally in a C-C bond or a C-H bond so hydrocarbon molecules are NONPOLAR so alkanes are not attracted to water (because “like dissolves like” and water is polar) - alkanes are held together by weak Van der Waals forces, therefore, they often exist as gases and h ...
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CH 3
CH 3

... • Boiling Points: Compounds with hydrogen bonding have higher than expected boiling points: at SATP, C2H6 = gas but CH3OH = liquid. • Solubilities: Compounds with hydrogen bonds are usually soluble in water (a polar molecule): C6H14 = insoluble in water but C5H11OH = soluble in water. • Solubility d ...
CH 3
CH 3

... • Boiling Points: Compounds with hydrogen bonding have higher than expected boiling points: at SATP, C2H6 = gas but CH3OH = liquid. • Solubilities: Compounds with hydrogen bonds are usually soluble in water (a polar molecule): C6H14 = insoluble in water but C5H11OH = soluble in water. • Solubility d ...
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Lecture 8-physical properties.pptx
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... • Aldehydes,
ketones,
carboxylic
acids,
esters,
and
amides
possess
the
carbonyl
group,
a
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double
bond,
but
differ
in
the
atom
or
group
of
atoms
connected
to
the
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of
the
carbonyl
group.

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to
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Chapter 12
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Functional Groups
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... consequence of relatively free rotations about the carbon-carbon single bonds. These rotations give rise to different conformations. However, with the exception of small-ring molecules, the alkanes, as compounds containing only carbon and hydrogen, are relatively weakly reactive substances. Most org ...
Functional Groups - hrsbstaff.ednet.ns.ca
Functional Groups - hrsbstaff.ednet.ns.ca

... • Many hydrocarbons contain C-H bonds which are weak dipoles. The several C-H bonds partially cancel each other out. There C-H bonds contribute very little to the polarity of a hydrocarbon – they are neglected when considering the polarity of the molecule ...
Functional Groups
Functional Groups

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Alkane



In organic chemistry, an alkane, or paraffin (a historical name that also has other meanings), is a saturated hydrocarbon. Alkanes consist only of hydrogen and carbon atoms and all bonds are single bonds. Alkanes (technically, always acyclic or open-chain compounds) have the general chemical formula CnH2n+2. For example, Methane is CH4, in which n=1 (n being the number of Carbon atoms). Alkanes belong to a homologous series of organic compounds in which the members differ by a molecular mass of 14.03u (mass of a methanediyl group, —CH2—, one carbon atom of mass 12.01u, and two hydrogen atoms of mass ≈1.01u each). There are two main commercial sources: petroleum (crude oil) and natural gas.Each carbon atom has 4 bonds (either C-H or C-C bonds), and each hydrogen atom is joined to a carbon atom (H-C bonds). A series of linked carbon atoms is known as the carbon skeleton or carbon backbone. The number of carbon atoms is used to define the size of the alkane e.g., C2-alkane.An alkyl group, generally abbreviated with the symbol R, is a functional group or side-chain that, like an alkane, consists solely of single-bonded carbon and hydrogen atoms, for example a methyl or ethyl group.The simplest possible alkane (the parent molecule) is methane, CH4. There is no limit to the number of carbon atoms that can be linked together, the only limitation being that the molecule is acyclic, is saturated, and is a hydrocarbon. Waxes include examples of larger alkanes where the number of carbons in the carbon backbone is greater than about 17, above which the compounds are solids at standard ambient temperature and pressure (SATP).Alkanes are not very reactive and have little biological activity. All alkanes are colourless and odourless. Alkanes can be viewed as a molecular tree upon which can be hung the more biologically active/reactive portions (functional groups) of the molecule.
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