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Revision: Some Basic Principles of Organic Chemistry JEE Main Some Basic Principles of Organic Chemistry

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Definitions [6]

Define a functional group.

An atom or a group of atoms attached to an alkyl group, which takes part in most of the chemical reactions, is called a functional group or functional radical.

Define isomerism.

Compounds having the same molecular formula but different structural formulas are called isomers and the phenomenon is called isomerism.

Define of chain isomerism.

When two or more compounds have a similar molecular formula but are different in the arrangement of carbon atoms in straight or branched chains, the compounds are referred to as chain isomers.

Definition: Organic Compounds

Organic compounds are the compounds of carbon.

Definition: Nomenclature

Nomenclature is the system of assignment of names to organic compounds.

Definition: Isomers

Compounds having the same molecular formula but different structural formula are known as Isomers and the phenomenon is known as Isomerism. (iso = same, meros = parts).

Formulae [1]

Give the general formula of carboxylic acids.

CnH2n+1COOH (or RCOOH)

Key Points

Key Points: Organic Compounds
  • Specification: Organic chemistry studies carbon compounds (excluding CO₂, carbonates, etc.).
  • Sources: Found in plants, animals, coal, petroleum, wood, and by fermentation.
  • Lab Synthesis: Many organic compounds are made in labs today.
  • Daily Use: Found in soaps, clothes, fuels, medicines, food, etc.
  • Importance: Organic compounds are used in almost every part of life.
Key points: Nomenclature of Carbon Compounds
  • The IUPAC system provides a unique, systematic way to name carbon compounds based on structure, replacing confusing common names.
  • An IUPAC name has three parts: prefix, parent, and suffix, reflecting the carbon chain and functional group.
  • The parent name is based on the longest carbon chain, and its ending changes to –ane, –ene, or –yne depending on the number of bonds.
  • Functional groups are shown as prefixes or suffixes, and the chain is numbered to give them the lowest possible number.
  • If the suffix begins with a vowel, the final ‘e’ in the parent alkane name is dropped (e.g., propane → propanone).
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