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Transcript of Organic Chemistry
![Page 1: Organic Chemistry](https://reader035.fdocuments.net/reader035/viewer/2022062517/568137ec550346895d9fa499/html5/thumbnails/1.jpg)
Organic Chemistry
The study of Carbon and its compounds
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ORGANIC CHEMISTRY• The study of compounds containing Carbon
atoms. • Carbon has 4 valence electrons, always draw it
with 4 covalent bonds around it.• When it forms all single bonds the shape of
around the carbon is TETRAHEDRAL.
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Properties
• Solubility– Most nonpolar (like dissolves like)– Most compounds are insoluble in water– Soluble in non-polar solvents
H
O
O
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Properties
• Most are non-electrolytes– Covalent, no conductivity– (an exception is organic acids)
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Properties
• Low Melting/ Boiling Points
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Properties
• Rate of Reaction– Slower than inorganic compounds– High activation energy
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Properties
• Bonding– Nonpolar covalent– Carbon has 4 valance electrons- tetrahedron– Carbon can bond with itself indefinitely (in dif.
shapes, many variations) Always make 4 bonds
C
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HYDROCARBONS
• Compounds containing only C and H.• 3 open chain families• ALKANES• ALKENES• ALKYNES
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Homologous Series or families
Group of related compounds in which each member differs from the next by one carbon and 2 hydrogens
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Alkanes• Single-bonded hydrocarbons• Hydrocarbon= only carbon and hydrogen atoms
IUPAC name Molecular Formula Generic Formulamethane CH4
ethane C2H6
propane C3H8
butane C4H10
pentane C5H12
hexane C6H14 CnH2n+2
heptane C7H16
octane C8H18
nonane C9H20
decane C10H22
• As the molecular size and dispersion forces increase, the boiling point and freezing point increase
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Table Q
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Alkenes
• have one Double-bonded hydrocarbon• Unsaturated• Same prefix as alkanes, with suffix -ene
Dienes contain TWO double bonds, and are not
alkenes!
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Alkynes
• one Triple-bonded hydrocarbon• Unsaturated• Same prefix as alkanes, and alkenes, with suffix -
yne
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Saturated vs Unsaturated compounds
Single Bonds Double/Triple Bonds
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Benzene•6 carbon atoms in a ring
Aromatic Hydrocarbon
Only structure really needs to be known for the regents.
Cyclic Hydrocarbons
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June 2
• How to draw and name different organic compounds?
• ISOMERS• HW : Read Wkbk pg 194-197 #’s 1 TO 18
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Isomers
• Compounds with:• the same molecular formulas • different structural formulas
C4 H10
Normal Butane 2-Methyl Propane
Although these structures look different, they both have the same molecular formula of C4 H10
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ISOMERS
• Same molecular formula but different structural formula. Have different chemical and physical properties.
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Alkyl Groups
• Have 1 less hydrogen (H) than the corresponding alkane
• Ex:• Methyl CH3 – 1 less H than CH4
• Ethyl C2H5 – 1 less H than C2H6
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Rules for naming organic compounds
For Straight or continuous chains: normal form n-alkanes.
For branched compounds:1.Find the longest continuous chain and name the
compound. Branches are alkyl groups and end with –yl. 2. The location of the alkyl group is determined by
assigning numbers to the carbon atoms of the longest chain, beginning at the end that will give the lowest number to the carbon that contains the alkyl or special group.
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Drawing Rules
Step 1 Step 2-ane, Alkane: draw all single bonds
-ene, Alkene: draw all single bonds except draw a double on the number carbon that is present in the name
-yne, Alkyne: draw all single bonds except draw a triple bond on the number carbon that is present in the name
Step 3It’s as easy as 1, 2, 3….
Make sure all carbons have 4 bonds
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Draw Hexane
1st Task:Draw Hexane
CCCCCC
Condensed Formula: CH3-CH2-CH2-CH2-CH2-CH3
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Draw 1-Pentene
2nd Task:-ane, Alkane: draw all single bonds
-ene, Alkene: draw all single bonds except draw a double on the number carbon that the prefix shows
-yne, Alkyne: draw all single bonds except draw a triple bond on the number carbon that the prefix shows
-ene, Alkene: draw all single bonds except draw a double on the number carbon that the prefix shows
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Draw 2-butyne
3rd Task:-ane, Alkane: draw all single bonds
-ene, Alkene: draw all single bonds except draw a double on the number carbon that the prefix shows
-yne, Alkyne: draw all single bonds except draw a triple bond on the number carbon that the prefix shows
-yne, Alkyne: draw all single bonds except draw a triple bond on the number carbon that the prefix shows
-yne, Alkyne: draw all single bonds except draw a triple bond on the number carbon that the prefix shows
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Draw: 2, 3-dimethylbutane
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Practice Problems• Using Table Q, what type of homologous
structure is this and why?
Why?•General formula•Structure•Name
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June 4
• Objective : Functional groups . • How to distinguish them and what do they do
to an organic compound?• Table R• HW P 201-204 #’s 34 TO 48
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Table ROrganic compounds and their
functional groups
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Halides (Halocarbons)
• A halide is formed when one or more halogen elements attach themselves to a chain of carbons atoms
• Halogen include all the elements in group 17
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Naming Halocarbons
• Halocarbons are usually formed from Alkenes– This is because the double bonds that are present
break; leaving empty bonds on the carbons where the halogens are now able to form
Double Bond
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Naming Halocarbons
• Every halogen has its own prefix to put at the beginning of its name– It is listed in Table R
• When the bonds brake;the halogens fill the empty space
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Alcohols
• Contain 1 less Hydrogen and in its place there is an –OH group instead.
• Even though alcohols have an –OH group, they are not considered a base.– This is because there are covalent bonds holding
the –OH to the carbons and bases don’t have covalent bonds present on the –OH.
– When in solution, acids only release an H+ and bases release OH-
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Naming Alcohols• You start with Alkane. (In this case, Methane)• Take away one of the Hydrogen atoms.• Add an –OH group to the empty space• For the name; drop the –e at the end of the prefix
(Methane) and add –ol to name the Alcohol!
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Ether
• In an ether, there is always an oxygen atom in between two carbons.
• And there can be any number of carbons on each side of the oxygen.
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Naming Ethers• Count the amount of carbons on the left side
of the Oxygen first.• Count the number of carbons on the right side
of the oxygen.• The carbons on the left make Methyl and the
carbons on the right make Ethyl, then put Ether at the
end.
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Aldehyde
• Aldehydes are known when there is one double bonded oxygen atom at the beginning or the end of a carbon chain.
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Forming Aldehydes• Start with a carbon chain (butane).• Drop off two Hydrogen atoms.• Add a double bonded oxygen to the open
carbon.
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Name It!• Four Carbons = butane• Since all aldehydes end in –al. Drop the –e
and add –al to the end.
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Ketone
• Ketones can be identified by the oxygen double bonded to a carbon in the middle of a carbon chain.
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Name a Ketone
• We have a chain of carbons (4=butane)• If the double bonded oxygen is found in the
middle of a carbon chain then it is a ketone and the –e must be dropped and add –one in its place
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Organic Acids!!!!!!• Contains a double bonded oxygen and an –OH to the
last carbon in the chain• Called acids because H+ ions are released when
dissolved in water• Since ions are present when dissolved, an electric
current can be conducted through the water• Organic acids are electrolytes!
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Name the acid
• HexaneDrop off the three hydrogen atoms at the end of the chainAdd a double bonded oxygen atom
and an –OH group to the open carbon atom
REMOVE: -e
ADD: -oic Acid
AND THERE YOU HAVE IT!!
Start with the carbon chainForm the Acid
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Ester• Esters have two oxygen atoms present– One is connected by double bonds to a carbon atom– The other is connected by single bonds but to two carbon
atoms• An ester is formed from the reaction of an acid and an
alcohol.
And Esters
smell
goood!!
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Title it!-count the number of carbons on the side that is only touching one carbon.
-Add –yl as the suffix.
-Now count the number of carbons in the chain attached to the two oxygen atoms.
-All that’s left is to add –oate to the end
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Amine
• Amines contain a nitrogen atom– the nitrogen atom is found at the end of a carbon
chain; attached to one carbon as well as two hydrogen.
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Naming the Amine is easy
• There are only two steps involved!– Count the hydrocarbons– Drop the –e and add –amine
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Amide
• Amides also contains a Nitrogen atom but attached to the same carbon is a double bonded oxygen.
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How do I name it??
• Amides are just the same as naming the amines except instead of adding –amine, you are adding –amide.
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Amino Acids
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Amino Acids…
• Contains both an amine and an organic acid
Amine
Organic Acid
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NOTE: All the example on how the groups are named are shown on table R in the far right column.
Note: The formulas on how each group is drawn is shown in the formula column.
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June 6
• OBJECTIVE: ORGANIC REACTIONS• Read pgs 206-208 #’s 49 to 63• TAKE HOME TEST• P 210 ANSWERS IN SCANTRON Q 1TO 30
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Organic Reactions
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1.CombustionTABLE I the first 6 rxn are
combustions• Burning (reaction with oxygen)• Hydrocarbons burn to form carbon dioxide
and water
Organic (hydrocarbon) + O2 CO2 +H20Organic (hydrocarbon) + O2 CO2 +H20heat
Test to show if there is Carbon Dioxide: Limewater (colorless) turns a milky white color with Carbon dioxide
In a limited supply of oxygen, C and CO are formed
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2. Substitution
• Replacement of one or more hydrogens in a saturated hydrocarbon by a halogen.
Alkane + halogen(X2) halocarbon + HX(g)
+ F2 + HFF
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3.Addition
• Adding one or more atoms at a double/ triple bond . Could be Hydrogenation (add H)Or Halogenation (add halogens)For alkenes and alkynes!
+ F2
F F
H H
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4.Esterification
• Acid and alcohol produce ester and water
Fats are Esters derived from glycerol (a trihydroxy alcohol- has 3 OH groups) and long fatty acids
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GlycerolFats are Esters derived from glycerol (a trihydroxy alcohol- has 3 OH groups) and long fatty acids
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5.Saponification
• (hydrolysis) Ester breaks up into Acid and Alcohol (reverse of esterification)
• Produces soap
Fat + Strong Base Soap + Glycerol
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6.Fermentation
C6H12O6 -------------> 2 C2H5OH + 2 CO2
Zymase (enzyme)
Glucose Ethanol Carbon Dioxide
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7 POLYMERIZATION
• Polymers are made of chains of smaller units called MONOMERS
• NATURAL POLYMERS• Protein, starches, cellulose• SYNTHETIC POLYMERS• Nylon, rayon, polyethylene
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7.Polymerization
• Small molecules join together to form bigger molecules (monomers to polymer)
amino acid + amino acid + amino acid proteinmonomer + monomer + monomer polymer
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Polymerization
• 2 Types:• Condensation Polymerization: –Dehydration synthesis, occur when water is
removed from primary alcohols. Have ether or ester linkages. –Make water and polymer
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• Addition Polymerization– Monomers join together by breaking a
double/triple bond
n nnumber of ethene join together number of polyethylene
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Finding missing reactants and products in Organic Reactions
• # of atoms on the left side of the arrow must equal # on the right
• After the elements/compounds are correctly written, change the coefficient
• Ex:• C2H6 + Cl2 C2H5Cl + ______
HCl
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Practice Regents Questions
• Go online to regentsprep.org!• http://regentsprep.org/Regents/core/questio
ns/questions.cfm?Course=CHEM&TopicCode=06
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