Organic Chemistry Class 11

Table of Content

Organic Chemistry Some basic principles and TechniquesGeneral IntroductionTetravalence of Carbon Shapes of Organic CompoundsStructural Representations of Organic CompoundsClassification of Organic CompoundsNomenclature of Organic CompoundsIsomerismFundamental Concepts in Organic Reaction MechanismMethods of Purification of Organic CompoundsQuantitative Analysis

Organic chemistry began to emerge as a science about 200 years ago. By the late eighteenth century, substances were divided into two classes called organic and inorganic compounds. Organic compounds were obtained from plants and animals. Organic compounds were more difficult to work within the laboratory and decompose easily.

What exactly makes a molecule organic?

The answer is in a single precious atom – CARBON. All organic molecules contain carbon, and to study organic chemistry is to study molecules made of carbon and to see what kinds of reactions they undergo and how they are put together. Therefore, Organic chemistry is the branch of chemistry that deals with the study of carbon compounds.

Organic Chemistry Class 11 Chapters

The chapter-wise list covered in NCERT Organic Chemistry Class 11 is tabulated below.

Section Number Chapter Name
12 Organic Chemistry – Some basic principles and Techniques
12.1 General Introduction
12.2 Tetravalency of Carbon (Shapes of Organic Compounds)
12.3 Structural representations of Organic Compounds
12.4 Classification of Organic Compounds
12.5 Nomenclature of Organic Compounds
12.6 Isomerism
12.7 Fundamental Concepts in organic Reaction Mechanism
12.8 Methods of Purification of Organic Compounds
12.9 Quantitative Analysis

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Organic Chemistry Class 11 NCERT

Organic Chemistry Some basic principles and Techniques

  1. Organic Chemistry – Organic chemistry is the study of carbon compounds that always contain carbon and it is limited to other elements. Compounds obtained from plants and animals were termed organic to indicate their ultimate source was a living organism.

Also, Read: Important Question on Organic Chemistry

General Introduction to Organic Chemistry

Organic chemistry is one of the most important disciplines of science which deals with the study of carbon compounds especially hydrocarbons and their derivatives.

Also, Read: Introduction to Organic Chemistry

Tetravalency of Carbon Shapes of Organic Compounds

  1. Catenation – Catenation can be defined as the self-linking of atoms of an element to form chains and rings. This definition can be extended to include the formation of layers (two-dimensional catenation) and space lattices (three-dimensional catenation).
  2. Tetravalency and small size – Carbon exhibits’ tetravalency. The tetravalency of carbon can be satisfied by forming bonds with carbon, hydrogen or other atoms. The carbon atom has 4 electrons in its valence shell. In order to account tetravalency it is believed during the process of bond formation which is energy-releasing process the two electrons in the 2s orbital get unpaired and out of them, one is promoted to empty orbital.

Tetravalency of Carbon

Also Read: Tetravalency of Carbon

Structural Representations of Organic Compounds

  1. Complete Structural Formula – Full structural equations show all the atoms in a molecule, the types of bonds that bind them, and how they are interconnected.
  2. Condensed Structural Formula –Β The Condensed structural formula is used to save space, structural formulas are conveniently abbreviated as condensed structural formulas.
  3. Bond Line Structural Formula – A bond-line structure is a less cluttered drawing than a condensed structural formula. However, to understand the simplified bond-line structure, the reader has to mentally add many more features to comprehend the overall structure.

Also Read: Structural Formula

Classification of Organic Compounds

  1. Acyclic or Open Chain Compounds & Alicyclic or Closed Chain or Ring Compounds – Organic compounds are classified as open-chain compounds and closed chain compounds in terms of the carbon chain. Also termed as Organic Compounds Acyclic or Open Chain or Aliphatic Compounds Cyclic or Closed Chain or Ring Compounds Alkanes Alkenes Alkynes
  2. Aromatic Compounds – Plants and micro-organisms have an exclusive route to benzene-ring compounds. The great majority of aromatic compounds in nature, therefore, are produced by plants and microorganisms, and animals are dependent upon plants for many aromatic compounds either directly or Indirectly.
  3. Heterocyclic Aromatic Compounds – In the twentieth century it is witnessed that the first inorganic heteroaromatic compound produced in the laboratory. Some of these heterocyclic aromatic compounds are very important in biochemical processes, drugs, and agrochemicals.

Classification of Organic Compounds

Also, Read: Aromatic Compounds

Nomenclature of Organic Compounds

  1. IUPAC Rules – Nomenclature of Organic Compounds follows recommendations of IUPAC in naming organic compounds, carbocations, etc. The International Union of Pure and Applied Chemistry (IUPAC) formulated rules for naming organic compounds.
  2. Types of Chemical Nomenclature – Chemical nomenclature is based primarily on naming a presumed geometrical arrangement of atoms. The International Union of Pure and Applied Chemistry(IUPAC) maintains several commissions that deal with the naming of chemical substances. In general, the approach of IUPAC is to present rules for arriving at names systematically.

Also, Read: IUPAC Nomenclature

Isomerism

  1. Structural Isomerism – Structural Isomerism arises due to different arrangement of atoms within the molecule. Two molecules are structural isomers if they share the same molecular formula.
  2. Stereoisomerism – Stereo-isomers are isomeric molecules having the same molecular formula and the same sequence of bonded atoms, but are only different in the 3D orientations of their atoms in space. Stereoisomerism may be of two types viz. geometrical (or c\s-trans) isomerism and optical (or d-1 or mirror-image) isomerism.

Also, Read: Isomerism

Fundamental Concepts in Organic Reaction Mechanism

  1. The Shapes of Carbon Compounds – Tetravalent carbon atom is the building block of structural organic chemistry. The four hydrogen atoms, with four carbon atoms, form a structure known as a tetrahedron.
  2. Functional Groups – Functional groups were introduced as a useful method for organizing this vast number of compounds because chemical reactions occur at the functional group and compounds with the same functional group undergo similar reactions.
  3. Homologous Series – A series of organic compounds in which every succeeding member differs from the previous one called Homologous Series.

Also, Read: Functional Groups

Methods of Purification of Organic Compounds

  1. Simple crystallization – Crystallization is one of the most effective purification techniques for solids. Simple crystallization involves the selection of the solvent and preparation of the solution.
  2. Fractional crystallization – Fractional crystallization is used for the purification of a single substance contaminated with small quantities of impurities.
  3. Sublimation – Sublimation is an excellent method for purifying relatively volatile organic solids on scales ranging from a few milligrams to tens of grams.
  4. Simple distillation – Simple distillation is the process of converting a liquid into its vapour, transferring the vapour to another place, and recovering the liquid by condensing the vapour.
  5. Fractional distillation – Fractional distillation is the separation procedure of a mixture into sections or fractions of its material. By heating them to a temperature at which one or more parts of the mixture vaporize, chemical compounds are isolated.
  6. Steam distillation – A steam distillation is simply a distillation in which steam is involved as a process component. Steam distillation and organic solvent extraction have both been widely used to extract compounds from spices.
  7. Azeotropic distillation – Azeotropic distillation is accomplished by adding to the liquid phase, a volatile third component that changes the volatility of one of the two components more than the other so that the components are separated by distillation.
  8. Chromatography – The purpose of preparative chromatography is to separate the components of a mixture for further use (and is thus a form of purification).

Also, Read: Purification of Organic Compounds

Quantitative Analysis

The elementary organic analysis is also considered, along with the development of the theory of analytical chemistry. Quantitative analysis refers to assessing how much is present in a sample of a given item. The quantity of any or all components of a sample can be expressed in terms of size, concentration, or relative abundance.

Also, Read: Salt Analysis

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