What is the common characteristic of the chemical substances generally known as CL- 20, HMX and LLM-105, which are sometimes talked about in media?

1. A. These are alternatives to hydro- fluorocarbon refrigerants
2. B. These are explosives in military weapons
3. C. These are high- energy fuels for cruise missiles
4. D. These are fuels for rocket propulsion

Answer: B

Explanation

CL-20 (Hexanitrohexaazaisowurtzitane), HMX (High Melting Explosive or Octogen), and LLM-105 (2,6-diamino-3,5-dinitropyrazine-1-oxide) are all advanced high-energy explosive materials. CL-20 is one of the most powerful non-nuclear explosives known, HMX is a widely used nitroamine explosive more powerful than RDX, and LLM-105 is an insensitive high explosive designed for enhanced safety. These substances are primarily developed and utilized in military and defense applications for their high detonation velocities and pressures. They are not refrigerants, nor are they typically used as fuels for cruise missiles or rocket propulsion, which rely on different chemical compositions for sustained thrust. The continuous advancements in defense technology and strategic materials are important for UPSC, especially in the context of national security and indigenous capabilities.