Types of organic reactions ppt

Organic compounds are called "organic" because they are associated with living organisms. These molecules form the basis for life and are studied in great detail in the chemistry disciplines of organic chemistry and biochemistry.

There are four main types, or classes, of organic compounds found in all living things: carbohydrateslipidsproteinsand nucleic acids.

Types of Organic Reactions - Chemistry - JEE - Aakash Digital

In addition, there are other organic compounds that may be found in or produced by some organisms. All organic compounds contain carbon, usually bonded to hydrogen other elements may be present as well. Let's take a closer look at the key types of organic compounds and see examples of these important molecules. Carbohydrates are organic compounds made of the elements carbon, hydrogen, and oxygen.

The ratio of hydrogen atoms to oxygen atoms in carbohydrate molecules is Organisms use carbohydrates as energy sources, structural units, and for other purposes.

Carbohydrates are the largest class of organic compounds found in organisms. Carbohydrates are classified according to how many subunits they contain.

Simple carbohydrates are called sugars. A sugar made of one unit is a monosaccharide.

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If two units are joined together, a disaccharide is formed. More complex structures form when these smaller units link to each other to form polymers.

Examples of these larger carbohydrate compounds include starch and chitin. Lipids are made of carbon, hydrogen, and oxygen atoms.

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Lipids have a higher hydrogen to oxygen ratio than is found in carbohydrates. The three major groups of lipids are triglycerides fats, oils, waxessteroids, and phospholipids. Triglycerides consist of three fatty acids joined to a molecule of glycerol. Steroids each have a backbone of four carbon rings joined to each other.

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Phospholipids resemble triglycerides except there is a phosphate group in place of one of the fatty acid chains. Lipids are used for energy storage, to build structures, and as signal molecules to help cells communicate with each other. Proteins consist of chains of amino acids called peptides.

A protein may be made from a single polypeptide chain or may have a more complex structure where polypeptide subunits pack together to form a unit. Proteins consist of hydrogen, oxygen, carbon, and nitrogen atoms.

Some proteins contain other atoms, such as sulfur, phosphorus, iron, copper, or magnesium. Proteins serve many functions in cells. They are used to build structure, catalyze biochemical reactions, for immune response, to package and transport materials, and to help replicate genetic material.

A nucleic acid is a type of biological polymer made up of chains of nucleotide monomers. Nucleotides, in turn, are made up of a nitrogenous base, sugar molecule, and phosphate group.

Cells use nucleic acids to code the genetic information of an organism. In addition to the four main kinds of organic molecules found in organisms, there are many other organic compounds.For details on it including licensingclick here. This book is licensed under a Creative Commons by-nc-sa 3. See the license for more details, but that basically means you can share this book as long as you credit the author but see belowdon't make money from it, and do make it available to everyone else under the same terms.

This content was accessible as of December 29,and it was downloaded then by Andy Schmitz in an effort to preserve the availability of this book. Normally, the author and publisher would be credited here. However, the publisher has asked for the customary Creative Commons attribution to the original publisher, authors, title, and book URI to be removed. Additionally, per the publisher's request, their name has been removed in some passages. More information is available on this project's attribution page.

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For more information on the source of this book, or why it is available for free, please see the project's home page. You can browse or download additional books there. To download a. Certain patterns are encountered repeatedly in organic reactions, many reflecting the interactions of nucleophiles and electrophiles.

In this section, we discuss five common types of organic reactions: substitution reactions, elimination reactions, addition reactions, radical reactions, and oxidation—reduction reactions. You have encountered many of these types of reactions previously, such as the formation of peptides by the elimination of water, the oxidation—reduction reactions that generate voltage in batteries, and chain reactions that involve organic radicals.

For more information on peptide formation, see Chapter 12 "Solids"Section For more information on batteries, see Chapter 19 "Electrochemistry". For more information on radicals, see Chapter 14 "Chemical Kinetics"Section In this section, we expand our discussion to include some of the mechanisms behind these reactions. In a substitution reaction A chemical reaction in which one atom or a group of atoms in a substance is replaced by another atom or a group of atoms from another substance.

A typical substitution reaction is reacting the hydroxide ion with methyl chloride:. Methyl chloride has a polar C—Cl bond, with the carbon atom having a partial positive charge. In Equation Reactions of this sort are called nucleophilic substitution reactions.

For this type of reaction to occur, the nucleophilic reactant must possess a pair of electrons and have a greater affinity for the electropositive carbon atom than the original substituent. One type of nucleophilic substitution reaction is shown in Equation In nucleophilic substitution reactions, the nucleophile must possess a pair of electrons and have a greater affinity for the electropositive species than the original substituent.

The convention for writing such a mechanism is to draw arrows showing the direction of electron flow—that is, from the electron-rich center the nucleophile to the electron-poor center the electrophile.

4. Types of Organic Reactions.ppt

The intermediate species, enclosed by square brackets, represents a transient arrangement of atoms that is only postulated to exist. Mustard gas. An example of a nucleophilic substitution reaction involves the chemical warfare agent known as mustard gas [ ClCH 2 CH 2 2 S], which caused aboutcasualties during World War I.

Mustard gas is toxic because it contains a chloride that can be displaced by nucleophilic amino groups in proteins, thereby allowing the molecule to irreversibly bond to a protein. Because the other product of the reaction is HCl, mustard gas causes severe burns to mucous membranes in the respiratory tract.

If mustard gas reacts with DNA deoxyribonucleic acidcross-linking of the DNA strands through sulfur occurs, which results in coding errors, the inhibition of replication, and disruption of other DNA functions.

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If mustard gas reacts with RNA ribonucleic acidprotein synthesis is altered see Section They have the general form. For more information on cleavage reactions, see Chapter 3 "Chemical Reactions"Section 3. A typical example is the conversion of ethyl chloride to ethylene:.

Elimination reactions are similar to cleavage reactions in inorganic compounds. Much of the approximately 26 million tons of ethylene produced per year in the United States is used to synthesize plastics, such as polyethylene. When an acid is produced, as occurs here, the reaction is generally carried out in the presence of a base such as NaOH to neutralize the acid.Were going to focus on just a few.

I- Addition Reactions In alkenes and alkynes In addition reactions, reactants are added to the carbon atoms in the double or triple bond. The double or triple bond is easily broken, since it is highly reactive.

In hydrogenation, Hydrogen atoms add to the carbon atoms of a double bond or triple bond. Unsaturated vegetable oils reduced to produce saturated fats used in margarine and cooking products. Hydration When hydration occurs with a double bond that has an unequal number of H atoms, the H atom bonds to the C in the double bond with the more H.

II- Substitution Reactions Are characteristic reaction of saturated compounds such as alkanes. Each step involves the substitution of one nucleophile chloride ion, Cl- or hydroxide ion, HO- by another Nucleophile: a molecule or ion that donates a pair of electrons to another molecule or ion to form a new covalent bond To be a good leaving group the substituent must be able to leave as a relatively stable, weakly basic molecule or ion In alkyl halides the leaving group is the halogen substituentit leaves as a halide ion Because halide ions are relatively stable and very weak bases, they are good leaving groups Substitution of alkyl halides with nuclophiles can occur by an SN2 or SN1 path, a fundamental difference between them is the timing of bond breaking and bond forming steps.

Nucleophilic, Bimolecular. Essential features of the S N2 Reaction Takes place in a single step without intermediates Incoming nucleophile reacts with the alkyl halide or the substrate from a direction opposite the group that is displaced the leaving group. The mechanism of the SN2 reaction when S bromobutane reacts with OH to give R -butanol The reaction takes place in a single step Incoming nucleophile approaches from a direction away from the leaving halide ion, thereby inverting the stereochemistry at carbon.

Carbocation: a species in which a carbon atom has only six electrons in its valence shell and bears positive charge Carbocations are classified as 1, 2, or 3 depending on the number of carbons bonded to the carbon bearing the positive charge. Lewis acids. Order of stability:. Mechanism of the SN1 reaction of 2-bromo-2methylpropane with H2O involves three steps.

The first step spontaneous, unimolecular dissociation of the alkyl bromide to yield a carbocation is rate-limiting. Elimination: removal of atoms or group of atoms from adjacent carbon to form a carbon-carbon double bond These are the opposite of additions This used to prepare alkenes An important elimination reaction is Dehydrohalogenation.

Oxidation of Primary Alcohols to Aldehydes A primary alcohol can be oxidized to an aldehyde or a carboxylic acid The oxidation is difficult to stop at the aldehyde stage and usually proceeds to the carboxylic acid. Oxidation of Secondary Alcohols to Ketones Oxidation of a secondary alcohol stops at the ketone.

Oxidation of biomolecules often occurs as dehydrogenation, electron acceptor which are usually coenzymes are needed for such reactions to occur. Practice Exercises: Classify the following rxns as substitution, elimination, or addition. Learn more about Scribd Membership Home. Read Free For 30 Days. Much more than documents. Discover everything Scribd has to offer, including books and audiobooks from major publishers. Start Free Trial Cancel anytime. Types of Organic Reactions. Uploaded by NurulMAprilia.

Document Information click to expand document information Date uploaded May 28, Did you find this document useful? Is this content inappropriate? Report this Document. Flag for inappropriate content. Download Now. Related titles. Carousel Previous Carousel Next.You see, the six types of reaction are only one of many different ways to categorize chemical reactions.

The real reason we learn about the types of reaction is that it allows us to figure out what will happen in a chemical reaction. A combustion reaction occurs when stuff burns. Combustion reactions take place when a compound containing carbon and hydrogen reacts with oxygen to make water vapor, carbon dioxide, and heat.

Consider the general form of a combustion reaction:. Basically, if anything containing C and H reacts with oxygen gas, you end up with carbon dioxide and water vapor. And lots of heat. British Petroleum BP was kind enough to spill a vast quantity of oil in the ocean insome of which was burned. Thanks BP! One example of combustion takes place when cyclohexane which is present in crude oil is burned:.

These birds like being covered in crude oil so much that many die from sheer joy. A synthesis reaction is a reaction in which simple compounds are combined to make a more complex one. An analogue you might see in everyday life if that of making a turkey sandwich — you start with two slices of bread and a slice of turkey and end up with a sandwich.

The general form for a synthesis reaction reflects this:. One specific example of this sort of reaction occurs when sodium and chlorine gas combine to make sodium chloride:.

Types of Chemical Reactions

A decomposition reaction is one where a molecule breaks apart into simpler ones. For example, I would guess that Johannes Sebastian Bach is in much simpler pieces now than when he was buried in I know… you were expecting me to tell that old joke.

Not gonna do it. In the chemical world, the general form for a decomposition reaction is this:.

types of organic reactions ppt

And an example of it occurs when hydrogen peroxide breaks apart to form oxygen gas and water:. The general form of this reaction is:. In this case, the elements A and B switched places. Many metals will boil when you place them into a strong acid. The general form for this reaction is:.After you enable Flash, refresh this page and the presentation should play.

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TYPES OF REACTIONS ppt

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Title: Types of Reaction in Organic Chemistry. Provided by: loretoscie. Tags: chemistry organic radicals reaction types. Latest Highest Rated. What causes it? How do we know that what we suggest is correct? Hydrogen chloride Methyl radical The methyl radical is now free to react with a chlorine molecule 14 Chlorine radical Methyl radical Chlorine Chloromethane Chlorine radical can now go and react with a methane molecule 15 Chlorine radical Methane The chlorine radical pulls the hydrogen and one electron across to it.

Hydrogen chloride Methyl radical The methyl radical is now free to react with a chlorine molecule 16 Chlorine radical Methyl radical Chlorine Chloromethane Chlorine radical can now go and react with a methane molecule 17 And on and on and on and on 18 Stage 3 Termination Grinding to a halt 19 Three different ways this can happen 20 Chlorine molecule Reaction stops No free radicals to keep it going Chlorine radical Chlorine radical 21 Chloromethane forms Reaction stops Because there are no free radicals to keep it going 22 Ethane Reaction stops because no free radicals to keep it going The formation of ethane proves that this is the mechanism Reaction speeded up by sources of free radicals such as tetraethyl lead.

If ethane is used instead of methane then butane will be formed rather than ethane as 2 ethyl radicals combine 25 The chlorination of methane is commonly called a Free Radical Substitution Reaction 26 Esterification Esters are formed when an alcohol and carboxylic acid react together This is called a condensation reaction as water is formed It could also be called a substitution reaction since the H of the OH group of the carboxylic acid molecule is replaced by an alkyl group 27 No Transcript 28 Formation of esters is Esterification It is important to remember the reaction can go backwards also ie.

The ester formed can react with the water to form the carboxylic acid and alcohol This reverse reaction is called Hydrolysis Hydrolysis will happen very easily in the presence of a base such as NaOH 29 This base hydrolysis of esters results in the formation of the sodium salt of the carboxylic acid NB see fig Can you describe in 4 steps and using diagrams the mechanism of a substitution reaction?

What is this mechanism called? What is a radical? What causes the formation of radicals? Can you name 3 types of substitution reaction? What 2 molecules react in an esterificateion raection 34 Learning Check What type of reaction is an esterification raection What is the reverse of an esterification raection called? What is the product of this type of raectiopn? Describe the mechanism of an addition reaction for Br2 and Ethene What is the evidence for this mechanism?A chemical reaction is a process generally characterized by a chemical change in which the starting materials reactants are different from the products.

Chemical reactions tend to involve the motion of electronsleading to the formation and breaking of chemical bonds. There are several different types of chemical reactions and more than one way of classifying them. Here are some common reaction types:. In a redox reaction, the oxidation numbers of atoms are changed.

Redox reactions may involve the transfer of electrons between chemical species. In a synthesis reactiontwo or more chemical species combine to form a more complex product. In a decomposition reactiona compound is broken into smaller chemical species.

A substitution or single displacement reaction is characterized by one element being displaced from a compound by another element.

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In a double displacement or metathesis reaction two compounds exchange bonds or ions in order to form different compounds. An acid-base reaction is a type of double displacement reaction that occurs between an acid and a base. A combustion reaction is a type of redox reaction in which a combustible material combines with an oxidizer to form oxidized products and generate heat exothermic reaction.

types of organic reactions ppt

Usually, in a combustion reaction oxygen combines with another compound to form carbon dioxide and water. In an isomerization reaction, the structural arrangement of a compound is changed but its net atomic composition remains the same. A hydrolysis reaction involves water.

There are hundreds or even thousands of types of chemical reactions! The main four types of reactions are direct combination, analysis reaction, single displacement, and double displacement. If you're asked the five main types of reactions, it is these four and then either acid-base or redox depending who you ask. Keep in mind, a specific chemical reaction may fall into more than one category.

Share Flipboard Email. Anne Marie Helmenstine, Ph. Chemistry Expert.After you enable Flash, refresh this page and the presentation should play. Get the plugin now. Toggle navigation. Help Preferences Sign up Log in. To view this presentation, you'll need to allow Flash. Click to allow Flash After you enable Flash, refresh this page and the presentation should play. View by Category Toggle navigation. Products Sold on our sister site CrystalGraphics.

Title: Types of Chemical Reactions.

types of organic reactions ppt

Description: Many chemical reactions have defining characteristics which allow them to be Metathesis is an alternate name for double replacement reactions.

Tags: chemical metathesis reactions types. Latest Highest Rated. The general form is A X? AX Example Magnesium oxygen?

Types of Reaction in Organic Chemistry - PowerPoint PPT Presentation

Some types of combination reactions Combination of elements K Cl2? One product will be formed 6 Combination Reactions K Cl2? Nonmetal oxide water? H2SO3 Metal oxide water? The general form is AX? A X Example Water can be decomposed by electrolysis. Ca OH 2?

CaO H2O Note that this is the reverse of a similar combination reaction. ZnCl2 3O2 Some of these reactions are used in explosives.


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