Organic chemistry
Notebook 1
[Source: Inštrukcije blog, 2025]
STRUCTURE OF MOLECULES OF
ORGANIC COMPOUNDS
Organic Compounds
,SUMMARY OF CONTENT
Unlock the World of Organic Chemistry: Notes That Truly Explain!
Does organic chemistry seem complicated and full of unknowns? Our notes are
designed to make this field not only clear but also fascinating! This isn't just dry
theory – we offer a comprehensive overview of key topics, enriched with a wealth of
exercises featuring highly detailed and easy-to-understand solutions. With
these notes, you'll truly grasp how organic chemistry works and how to solve even
the most complex problems!
What Our Notes Cover:
You'll dive into the fundamentals of organic chemistry and learn about:
• Basics of Organic and Inorganic Compounds: Discover why carbon is so
special and how to differentiate organic compounds from inorganic ones. Our
notes will teach you to identify and explain the key distinctions, which is the
foundation for understanding all of organic chemistry.
• Atomic Structure and Chemical Bonds: This section will cover the role of
valence electrons and provide deep insight into various types of covalent
bonds, including single, double, triple, and coordinate covalent bonds. You'll
also learn why carbon forms specific types of bonds and what determines
bond length between atoms. In addition to covalent bonds, we'll explore ionic
bonds, understanding how they form through the transfer of electrons and the
resulting electrostatic attraction between ions.
• Hydrocarbons and Their Structures: Through clear explanations and
practical examples, you'll learn about structural formulas, how carbon atoms
bond in chains and rings, and the concept of skeletal formulas. You'll become
familiar with both cyclic and acyclic molecular forms and easily draw them.
• Determining Elements in Organic Compounds: Our notes will guide you
through various methods for proving the presence of carbon, hydrogen,
nitrogen, sulfur, and halogens in organic compounds. Lassaigne's test and
other key analytical methods will be explained in detail, helping you
understand the composition of unknown substances.
• Quantitative and Empirical Formulas: You'll learn to determine the empirical
and molecular formulas of organic compounds based on mass fractions of
, elements, allowing you to deduce the exact composition and structure of
substances. You'll also understand the concepts of molecular, structural, and
empirical formulas.
Why Our Exercises Are Your Best Path to Success:
Each topic is supplemented with an extensive collection of carefully selected
exercises that aren't just questions, but opportunities for true learning. For every
exercise, you receive:
• Comprehensive Step-by-Step Explanations: We won't just give you the final
answer. Each solution is explained in detail, allowing you to understand every
single step of the problem-solving process. This is crucial for solidifying your
knowledge and independently solving similar problems.
• Diverse Exercise Types:
o Identification and Classification: E.g., determining whether a compound
is organic or inorganic, and recognizing cyclic and acyclic
hydrocarbons.
o Counting and Drawing Bonds: Practice determining the number of
valence electrons and drawing various types of covalent bonds,
including electron pairs.
o Naming and Explaining Concepts: Learn to define and explain key
terms like molecular, structural, and empirical formulas, and the
concept of amount of substance.
o Analysis and Element Detection: Solve exercises involving the
interpretation of Lassaigne's test results and other chemical analyses to
determine the presence of specific elements in organic compounds.
o Calculating Empirical and Molecular Formulas: Practice solving more
complex problems where you determine a compound's formula based
on mass fractions and relative molecular mass.
Don't let organic chemistry intimidate you! With our notes and meticulously solved
exercises, you'll master all key concepts and gain the confidence to tackle any
challenge.
Are you ready to embark on a journey into the fascinating world of organic
chemistry?
,TABLE OF CONTENTS
1 THEORY .............................................................................................................. 1
2 TASKS ............................................................................................................... 11
3 TASKS OF SOLUTIONS ................................................................................... 23
4 LITERATURE AND SOURCES ......................................................................... 53
APPENDICES ........................................................................................................... 56
,TABLE OF FIGURES
Image 1: Urea…………………………………………………………………………………1
Image 2: Model of the Carbon Atom ........................................................................... 3
Image 3: Diagram of the Basic Steps of Lassaigne's Test ......................................... 7
Image 4: Schematic representation of bond length .................................................. 13
Image 5: Elements of the modern periodic table ...................................................... 24
,TABLE OF TABLES
Table 1: Demonstrating Elements in Organic Compounds ......................................... 6
, Organic chemistry notes
1 THEORY
Organic compounds, such as hydrocarbons (for example, methane), organic
halogenated compounds (for example, chloroform), organic oxygen compounds (for
example, ethanol), and organic nitrogen compounds (for example, amino acids), are
all chemical compounds that contain carbon, except for those that are not considered
organic: carbon monoxide, carbon dioxide, hydrogen cyanide, cyanides, carbonates,
bicarbonates, and carbides.
Carbon (C) is a very abundant element in nature and serves as the fundamental
component of all compounds that make up all living beings. Therefore, organic
chemistry is defined as the chemistry of carbon compounds. Organic compounds
found in nature can also be produced artificially. Through planned organic synthesis,
we can obtain compounds with precisely defined properties. In this way, we can
prepare an organic compound from an inorganic compound, such as urea* (see image
1).
Image 1: Urea
Source: Vizda, 2025
Today, we know many natural and industrially produced organic compounds, including
various types of plastics, clothing made from natural and synthetic fibers, detergents,
pharmaceuticals, pesticides, natural and synthetic dyes, and much more.
Source: Graunar, M., Podlipnik, M., Cvirn-Pavlin,T.,2019; ECP, 2025; Chemistry,
2025; Rakovec, B., 2025
1
, Organic chemistry notes
Important facts about carbon Source: Graunar, M., Podlipnik, M., Cvirn-Pavlin,T.,209
• Carbon forms many more compounds than all other elements combined. This
is due to the four outer (valence) electrons*, which represent "free spaces"
where different atoms or groups of atom can bond.
• Carbon atoms typically do not form ions*. The reason fort his lies in the structure
of the valence shell. Carbon has four valence electrons in its outer shell. To
achieve a stable electronic configuration, it would need to lose four electrons to
become a positive ion or gain four electrons to become a negative ion. Both
processes require a lot of energy. Since carbon is in the middle of the periodic
table, it is easier for it to share electrons to gain or lose them.
• Carbon atoms form four strong covalent bonds* with each other or with atoms
of other elements, which means that carbon compounds are stable. We
determine the elements in a carbon compound by breaking the molecule down
into smaller molecules or ions (see subsection 1.1 Elemental composition of
organic compounds).
• Carbon atoms can form single, double, and triple bonds, and can link together
into long chains such as propane, propene and propyne or rings such as
cyclopropane, which further increases the diversity of compounds they can
form.
• Compounds with a single bond called alkanes, with a double bond alkenes,
and with a triple bond alkynes.
PROPANE PROPENE PROPYNE
(single bonds (-)) (double bonds (=)) (triple bonds (≡))
CYCLOPROPANE
Source: Graunar, M., Podlipnik, M., Cvirn-Pavlin,T., 2019; Graunar, M., Košmrlj, B.,
2019
2
Notebook 1
[Source: Inštrukcije blog, 2025]
STRUCTURE OF MOLECULES OF
ORGANIC COMPOUNDS
Organic Compounds
,SUMMARY OF CONTENT
Unlock the World of Organic Chemistry: Notes That Truly Explain!
Does organic chemistry seem complicated and full of unknowns? Our notes are
designed to make this field not only clear but also fascinating! This isn't just dry
theory – we offer a comprehensive overview of key topics, enriched with a wealth of
exercises featuring highly detailed and easy-to-understand solutions. With
these notes, you'll truly grasp how organic chemistry works and how to solve even
the most complex problems!
What Our Notes Cover:
You'll dive into the fundamentals of organic chemistry and learn about:
• Basics of Organic and Inorganic Compounds: Discover why carbon is so
special and how to differentiate organic compounds from inorganic ones. Our
notes will teach you to identify and explain the key distinctions, which is the
foundation for understanding all of organic chemistry.
• Atomic Structure and Chemical Bonds: This section will cover the role of
valence electrons and provide deep insight into various types of covalent
bonds, including single, double, triple, and coordinate covalent bonds. You'll
also learn why carbon forms specific types of bonds and what determines
bond length between atoms. In addition to covalent bonds, we'll explore ionic
bonds, understanding how they form through the transfer of electrons and the
resulting electrostatic attraction between ions.
• Hydrocarbons and Their Structures: Through clear explanations and
practical examples, you'll learn about structural formulas, how carbon atoms
bond in chains and rings, and the concept of skeletal formulas. You'll become
familiar with both cyclic and acyclic molecular forms and easily draw them.
• Determining Elements in Organic Compounds: Our notes will guide you
through various methods for proving the presence of carbon, hydrogen,
nitrogen, sulfur, and halogens in organic compounds. Lassaigne's test and
other key analytical methods will be explained in detail, helping you
understand the composition of unknown substances.
• Quantitative and Empirical Formulas: You'll learn to determine the empirical
and molecular formulas of organic compounds based on mass fractions of
, elements, allowing you to deduce the exact composition and structure of
substances. You'll also understand the concepts of molecular, structural, and
empirical formulas.
Why Our Exercises Are Your Best Path to Success:
Each topic is supplemented with an extensive collection of carefully selected
exercises that aren't just questions, but opportunities for true learning. For every
exercise, you receive:
• Comprehensive Step-by-Step Explanations: We won't just give you the final
answer. Each solution is explained in detail, allowing you to understand every
single step of the problem-solving process. This is crucial for solidifying your
knowledge and independently solving similar problems.
• Diverse Exercise Types:
o Identification and Classification: E.g., determining whether a compound
is organic or inorganic, and recognizing cyclic and acyclic
hydrocarbons.
o Counting and Drawing Bonds: Practice determining the number of
valence electrons and drawing various types of covalent bonds,
including electron pairs.
o Naming and Explaining Concepts: Learn to define and explain key
terms like molecular, structural, and empirical formulas, and the
concept of amount of substance.
o Analysis and Element Detection: Solve exercises involving the
interpretation of Lassaigne's test results and other chemical analyses to
determine the presence of specific elements in organic compounds.
o Calculating Empirical and Molecular Formulas: Practice solving more
complex problems where you determine a compound's formula based
on mass fractions and relative molecular mass.
Don't let organic chemistry intimidate you! With our notes and meticulously solved
exercises, you'll master all key concepts and gain the confidence to tackle any
challenge.
Are you ready to embark on a journey into the fascinating world of organic
chemistry?
,TABLE OF CONTENTS
1 THEORY .............................................................................................................. 1
2 TASKS ............................................................................................................... 11
3 TASKS OF SOLUTIONS ................................................................................... 23
4 LITERATURE AND SOURCES ......................................................................... 53
APPENDICES ........................................................................................................... 56
,TABLE OF FIGURES
Image 1: Urea…………………………………………………………………………………1
Image 2: Model of the Carbon Atom ........................................................................... 3
Image 3: Diagram of the Basic Steps of Lassaigne's Test ......................................... 7
Image 4: Schematic representation of bond length .................................................. 13
Image 5: Elements of the modern periodic table ...................................................... 24
,TABLE OF TABLES
Table 1: Demonstrating Elements in Organic Compounds ......................................... 6
, Organic chemistry notes
1 THEORY
Organic compounds, such as hydrocarbons (for example, methane), organic
halogenated compounds (for example, chloroform), organic oxygen compounds (for
example, ethanol), and organic nitrogen compounds (for example, amino acids), are
all chemical compounds that contain carbon, except for those that are not considered
organic: carbon monoxide, carbon dioxide, hydrogen cyanide, cyanides, carbonates,
bicarbonates, and carbides.
Carbon (C) is a very abundant element in nature and serves as the fundamental
component of all compounds that make up all living beings. Therefore, organic
chemistry is defined as the chemistry of carbon compounds. Organic compounds
found in nature can also be produced artificially. Through planned organic synthesis,
we can obtain compounds with precisely defined properties. In this way, we can
prepare an organic compound from an inorganic compound, such as urea* (see image
1).
Image 1: Urea
Source: Vizda, 2025
Today, we know many natural and industrially produced organic compounds, including
various types of plastics, clothing made from natural and synthetic fibers, detergents,
pharmaceuticals, pesticides, natural and synthetic dyes, and much more.
Source: Graunar, M., Podlipnik, M., Cvirn-Pavlin,T.,2019; ECP, 2025; Chemistry,
2025; Rakovec, B., 2025
1
, Organic chemistry notes
Important facts about carbon Source: Graunar, M., Podlipnik, M., Cvirn-Pavlin,T.,209
• Carbon forms many more compounds than all other elements combined. This
is due to the four outer (valence) electrons*, which represent "free spaces"
where different atoms or groups of atom can bond.
• Carbon atoms typically do not form ions*. The reason fort his lies in the structure
of the valence shell. Carbon has four valence electrons in its outer shell. To
achieve a stable electronic configuration, it would need to lose four electrons to
become a positive ion or gain four electrons to become a negative ion. Both
processes require a lot of energy. Since carbon is in the middle of the periodic
table, it is easier for it to share electrons to gain or lose them.
• Carbon atoms form four strong covalent bonds* with each other or with atoms
of other elements, which means that carbon compounds are stable. We
determine the elements in a carbon compound by breaking the molecule down
into smaller molecules or ions (see subsection 1.1 Elemental composition of
organic compounds).
• Carbon atoms can form single, double, and triple bonds, and can link together
into long chains such as propane, propene and propyne or rings such as
cyclopropane, which further increases the diversity of compounds they can
form.
• Compounds with a single bond called alkanes, with a double bond alkenes,
and with a triple bond alkynes.
PROPANE PROPENE PROPYNE
(single bonds (-)) (double bonds (=)) (triple bonds (≡))
CYCLOPROPANE
Source: Graunar, M., Podlipnik, M., Cvirn-Pavlin,T., 2019; Graunar, M., Košmrlj, B.,
2019
2
