1. The chapter introduces organic chemistry and the different functional groups that classify organic compounds.
2. It describes IUPAC nomenclature rules for systematically naming organic structures and explains how to identify substituents.
3. The chapter covers different types of isomerism including structural, stereoisomers, and optical isomers that can exist.
Basic concepts of organic chemistry such as structural formulas, different kinds of representation, types of isomerism, examples, alkanes, alkenes, alkynes etc.
In chemistry, acids and bases have been defined differently by three sets of theories. One is the Arrhenius definition, which revolves around the idea that acids are substances that ionize (break off) in an aqueous solution to produce hydrogen (H+) ions while bases produce hydroxide (OH-) ions in solution.
Basic concepts of organic chemistry such as structural formulas, different kinds of representation, types of isomerism, examples, alkanes, alkenes, alkynes etc.
In chemistry, acids and bases have been defined differently by three sets of theories. One is the Arrhenius definition, which revolves around the idea that acids are substances that ionize (break off) in an aqueous solution to produce hydrogen (H+) ions while bases produce hydroxide (OH-) ions in solution.
Isomers are molecules with the same molecular formula, but different structural or spatial arrangements of the atoms within the molecule. The reason there are such a colossal number of organic compounds which is more than 10 million is partly due to isomerism.
I hope You all like it. I hope It is very beneficial for you all. I really thought that you all get enough knowledge from this presentation. This presentation is about materials and their classifications. After you read this presentation you knowledge is not as before.
Structural diagrams,condensed structures and line structures of hydrocarbons.How to identify a substance as Organic and inorganic ?.How to classify hydrocarbons? What is the difference between alkanes,alkenes and alkynes?
Organic compound nomenclature (ALkanes, ALKYL GROUP, ALKENE, ALKYNES)Tasneem Ahmad
for vedio click on this linkhttps://www.youtube.com/watch?v=ZzIxkWDlf5Q&feature=youtu.be
Organic compound nomenclature (ALkanes, ALKYL GROUP, ALKENE, ALKYNES)
The complete presentation on Organic Compound, IMPORTANCE, PROPERTIES, SOURCE, USED, Nomenclature Of Organic Compound
Alkanes are organic compounds that consist entirely of single-bonded carbon and hydrogen atoms and lack any other functional groups. Alkanes have the general formula CnH2n+2 and can be subdivided into the following three groups: the linear straight-chain alkanes, branched alkanes, and cycloalkanes.
Preparation, reactions, Acidity, effect of substituents on acidity, structure and uses of carboxylic acid and identification tests for carboxylic acid, amide and ester
In organic chemistry, a carbonyl group is a functional group composed of a carbon atom double-bonded to an oxygen atom: C=O. It is common to several classes of organic compounds, as part of many larger functional groups. A compound containing a carbonyl group is often referred to as a carbonyl compound.
Organic reactions are chemical reactions involving organic compounds. Organic reactions are used in the construction of new organic molecules. The production of many man-made chemicals such as drugs, plastics, food additives, fabrics depend on organic reactions.
Isomers are molecules with the same molecular formula, but different structural or spatial arrangements of the atoms within the molecule. The reason there are such a colossal number of organic compounds which is more than 10 million is partly due to isomerism.
I hope You all like it. I hope It is very beneficial for you all. I really thought that you all get enough knowledge from this presentation. This presentation is about materials and their classifications. After you read this presentation you knowledge is not as before.
Structural diagrams,condensed structures and line structures of hydrocarbons.How to identify a substance as Organic and inorganic ?.How to classify hydrocarbons? What is the difference between alkanes,alkenes and alkynes?
Organic compound nomenclature (ALkanes, ALKYL GROUP, ALKENE, ALKYNES)Tasneem Ahmad
for vedio click on this linkhttps://www.youtube.com/watch?v=ZzIxkWDlf5Q&feature=youtu.be
Organic compound nomenclature (ALkanes, ALKYL GROUP, ALKENE, ALKYNES)
The complete presentation on Organic Compound, IMPORTANCE, PROPERTIES, SOURCE, USED, Nomenclature Of Organic Compound
Alkanes are organic compounds that consist entirely of single-bonded carbon and hydrogen atoms and lack any other functional groups. Alkanes have the general formula CnH2n+2 and can be subdivided into the following three groups: the linear straight-chain alkanes, branched alkanes, and cycloalkanes.
Preparation, reactions, Acidity, effect of substituents on acidity, structure and uses of carboxylic acid and identification tests for carboxylic acid, amide and ester
In organic chemistry, a carbonyl group is a functional group composed of a carbon atom double-bonded to an oxygen atom: C=O. It is common to several classes of organic compounds, as part of many larger functional groups. A compound containing a carbonyl group is often referred to as a carbonyl compound.
Organic reactions are chemical reactions involving organic compounds. Organic reactions are used in the construction of new organic molecules. The production of many man-made chemicals such as drugs, plastics, food additives, fabrics depend on organic reactions.
1. FHSC1124
Organic Chemistry
Introduction to Organic
Chemistry
Chapter 1
2. Chapter Scopes
• Introduction
• Homologous series
• Functional groups
• Naming/Nomenclature
• Isomerisms
3. Objectives
After this chapter, you will:
• Learn and differentiate functional
groups
• Learn to name organic compounds
according to IUPAC nomenclature
and draw correct structure
• Learn about types of isomerism
5. Introduction to Organic Chemistry
• Organic compounds are classified into
different types, such as alkanes, alkenes,
alcohols, amines and etc.
• Each type of organic compound contains
the same reactive group of atoms, which is
called functional group.
E.g. alcohols contain the –OH functional
group
6. Functional Groups
Functional Group Structure
Alkane R–H
Alkene (Olefin) C=C (ethylenic bond)
Alkyne C≡C (acetylenic bond)
Alcohol R – O – H (hydroxyl)
Arenes (aromatic Ar (Aryl)
hydrocarbon)
Aldehyde O
R–C–H
7. Functional Group Structure
Ketone O
R – C – R’
Carboxylic Acid O (carboxyl)
R – C – OH
Ester O
R – C – O – R’
8. Functional Group Structure
Anhydride O O
R – C – O – C – R’
Amide O
R – C – NH2
Amine R – NH2
Nitrile
9. IUPAC Nomenclature
• IUPAC International Union of Pure &
Applied Chemistry
• The IUPAC nomenclature system is a set
of logical rules devised and used by
organic chemists to name the organic
compounds.
10. IUPAC Rules
1. Select the longest continuous C chain as
parent chain (use root word for the no. of C)
2. Name each of the branch/substituents as an
alkyl / aryl group
3. Number the C chain begin from the end
nearest to the branch
⇒ branch/substituents appear at the lowest
no. possible
11. 4. Name each substituent according to its
chemical identity & the no. of the C atom
to which it is attached
⇒ For identical substituent, use the prefix
di, tri… & write appropriate C no. for each
substituent
5. Separate no. from no. by commas (,) & no.
from letters by hyphens (-)
6. List the substituents alphabetically by
name ⇒ di, tri…. don’t count
12. IUPAC Nomenclature
Functional Group Nomenclature
Alkane End with -ane
Alkene End with –ene
Arene End with –benzene
Alcohol End with –ol
Aldehyde End with –al
Ketone End with –one
13. Functional Group Nomenclature
Carboxylic acid End with –oic acid
Ester End with –oat
Anhydride End with –oic anhydride
Amine End with –amine
Amide End with –amide
Nitrile End with –nitrile
14. Base Names
Prefix No. of Prefix No. of
Carbons (n) Carbons (n)
Meth 1 Hex 6
Eth 2 Hept 7
Prop 3 Oct 8
But 4 Non 9
Pent 5 Dec 10
15. Straight-Chain Alkyl Groups, R
Alkyl group Name (abbreviation)
−CH3 Methyl (Me)
−CH2CH3 Ethyl (Et)
−CH2CH2CH3 Propyl (Pr)
−CH2CH2CH2CH3 Butyl (Bu)
−CH2CH2CH2CH2CH3 Pentyl
• Alkyl groups are named by replacing the
–ane ending of the parent alkane with an
–yl ending
16. Naming of Identical
Branch Substituents
No. of substituents Prefix
2 Di
3 Tri
4 Tetra
17. Isomerism
Definition of isomerism:
• A phenomena where 2 or more
compounds have the same molecular
formulae but with different arrangements
of their constituent atoms
• Such molecules are known as isomers
18. Isomerism
Isomerism
Structural Stereoisomerism
Isomerism
Optical
Isomerism
Chain Isomerism
Geometric
Position Isomerism Isomerism
Functional Group Isomerism
19. Structural Isomerism
• Isomers have the same molecular formulae
but different structural formulae
1. Chain Isomerism
• The isomers are from the same homologous
series & have the same functional groups but
different type of carbon chain.
• Example: C4H10
20. 2. Position Isomerism
• The isomers are from the same
homologous series & have the same
functional groups but the position / location
of the functional group is different
• Same C skeleton
• Example: C3H8O
21. 3. Functional Group Isomerism
• The isomers are from different homologous
series & have different functional groups
• The chemical & physical properties are
different
• Example: C3H6O
22. Geometric Isomerism
(Cis-trans Isomerism)
• The atoms making up the isomers are
joined up in the same order, but manage to
have a different spatial arrangement.
• Due to restricted rotation of groups in
double bonds & in cyclic compounds.
23. Example: Geometric Isomerism
H Cl H H
C C C C
Cl H Cl Cl
trans-1,2-dichloroethene cis-1,2-dichloroethene
• trans isomer − 2 chlorine atoms are locked
on opposite sides of the double bond
(trans : Latin meaning "across“)
• cis isomer − 2 chlorine atoms are locked
on the same side of the double bond
(cis : Latin meaning "on this side")
24.
25. The Effect of Geometric Isomerism
on Physical Properties
1. cis isomer has higher boiling point.
• Bp depends on the polarity of the molecules
• cis isomers are > polar, stronger attractive
intermolecular forces exist between cis
isomer
2. trans isomer has higher melting point.
• Mp depends on the arrangement & packing
of molecules in the crystal lattice
• trans isomer with > symmetrical structure,
can be > closely packed in the crystal lattice
26. ?? Cis-isomer has higher bp
• e.g. 1,2-dichloroethene
• 1 side will be more positive charge & the
other side more negative ⇒ polar
• Van der Waals + dipole-dipole interaction
• Need extra energy ⇒ bp increases
27. ?? Trans-isomer has lower bp
• the slight charge on the top of the molecule
is exactly balanced by an equivalent
charge on the bottom
• No dipole-dipole force as it is non-polar
molecule.
• Thus, only held by weak Van der Waals
• Less energy needed ⇒ lower bp
28. ?? Trans-isomer has lower bp
• Trans-isomer
• No dipole-dipole force as it is non-polar
molecule.
• Thus, only held by weak Van der Waals
• Less energy needed ⇒ lower bp
29. ?? Trans-isomer has higher mp
• trans isomer has the higher melting point
Melting point = solid ⇒ solution
• In order for the intermolecular forces to
work well, the molecules must be able to
pack together efficiently in the solid.
• Trans isomers pack better than cis
isomers. The "U" shape of the cis isomer
doesn't pack as well as the straighter
shape of the trans isomer.
30. ?? Cis-isomer has lower mp
• The poorer packing in the cis isomers
means that the intermolecular forces aren't
as effective be
• Less energy is needed ⇒ mp lower
31. Optical Isomerism
• Optical isomers are 2 compounds with the
same structural formulae, but one isomer
is the mirror image of the other & cannot
be superimposed on one another in any
orientation
• It occurs when 4 different groups of atoms
are joined to a C atom by 4 single covalent
bonds.
32. Optical Isomerism
• Occurs because of the tetrahedral bonding
around a C atom
• Structures that can exist as 2 optical
isomers are said to be optically active &
possess a chiral centre
• Simple substances which show optical
isomerism exist as two isomers known as
enantiomers
• Chiral centre = atom bond with the 4
different groups, which is normally marked
with an asterisk (∗)
34. Example: Optical Isomerism
• It is important this
time to draw the
COOH group
backwards in the
mirror image.
Incorrect
35. Exercise
For each of the following molecules, draw the
possible stereoisomers and state the type of
stereoisomers shown.
(a) C6H5CH=CHCOOH
(b) C6H5−CH(Cl)−CH=CH2
(c) CH3CH=CHCH3
(d) CH3CH2CH(NH2)COOH
36. Summary
use IUPAC nomenclature to name and
draw correct structure of simple organic
compounds with different functional
groups.
Differentiate types of isomerism and draw
isomers.