Course Content
UPSC Notes Samples
Full Syllabus Covered | 100% as per Official UPSC Syllabus
0/46
1. Art & Culture Sample
Covered under topic 1. Indian culture will cover the salient aspects of Art Forms, Literature and Architecture from ancient to modern times.
0/67
1. Indian culture will cover the salient aspects of Art Forms, Literature and Architecture from ancient to modern times. (copy)
0/67
2. Modern Indian history from about the middle of the eighteenth century until the present- significant events, personalities, issues. (copy)
0/66
5. History of the world will include events from the 18th century such as Industrial revolution, World wars, Redrawal of national boundaries, Colonization, Decolonization, Political philosophies like Communism, Capitalism, Socialism etc.- their forms and effect on the society.
0/59
7. Role of women and women’s organizations, Population and associated issues, Poverty and developmental issues, Urbanization, their problems and their remedies.
0/41
10.2. Introduction to Maps
0/1
GS2
All topics that need updates are given below.
2. Functions and responsibilities of the Union and the States, issues and challenges pertaining to the federal structure, devolution of powers and finances up to local levels and challenges therein.
All topics that need updates are given below.
0/36
5. Parliament and State Legislatures – structure, functioning, conduct of business, powers & privileges and issues arising out of these.
All topics that need updates are given below.
0/31
6. Structure, organization and functioning of the Executive and the Judiciary; Ministries and Departments of the Government; pressure groups and formal/informal associations and their role in the Polity.
All topics that need updates are given below.
0/47
12. Welfare schemes for Vulnerable Sections of the Population by the Centre and States and the Performance of these schemes; Mechanisms, Laws, Institutions and Bodies constituted for the Protection and Betterment of these Vulnerable Sections.
All topics that need updates are given below.
0/33
GS3
All topics that need updates are given below.
11. Science and Technology- developments and their applications and effects in everyday life.
0/1
GS3: BIODIVERSITY AND ENVIRONMENT
All topics that need updates are given below.
1. Environment
0/151
GS4
All topics that need updates are given below.
GS3: SCIENCE AND TECHNOLOGY
All topics given below
0/1
1. Motion & Measurements
0/46
9. Metals & Non-Metals
0/23
10. Energy
0/49
12. Plant Organisms
0/33
14. Life Processes
0/42
18. Biotechnology
0/88
19. Information Technology
0/59
20. Space Technology
0/64
National & International Current Affairs (CA) 2025
Current affairs of all months are given below
delete UPSC Sample Notes [English]

iv.3. Versatile Nature of Carbonand its compounds: The Tetravalency and Catenation of Carbon

Tetravalency and Catenation

  • The fact that carbon can form single, double, and triple bonds demonstrates its versatility. 
    • It can also form chains, branching chains, and rings when joined to other carbon atoms.
    • It’s a versatile element that can be found in a wide variety of chemical combinations. 
  • Carbon’s versatility is best appreciated through properties like tetravalency and catenation.
    • Tetravalency: Carbon has a valency of four, so it is capable of bonding with four other atoms of carbon or atoms of some other mono-valent element.
    • Catenation: The property of a carbon element due to which its atom can join one another to form long carbon chains is called catenation.
      • S8: In its native state, sulphur shows catenation of up to 8 atoms in the form of S8 molecule. It has a puckered ring structure.