Domestic energy basics: Liquefied Petroleum Gas (LPG) used for household cooking primarily consists of which hydrocarbon components under standard supply blends?

Introduction / Context:
LPG supplied for household cooking is a pressurized mixture of light hydrocarbons chosen for safe handling, suitable vapor pressure at ambient conditions, and clean combustion. Knowing its typical composition is standard refinery and utilities knowledge.

Given Data / Assumptions:

• LPG refers to bottled/cylinder cooking gas for domestic use.
• Typical climate: ambient temperatures where cylinders can vaporize normally.
• Commercial blends may vary seasonally but remain within conventional propane–butane ranges.

Concept / Approach:
LPG is chiefly C3–C4 hydrocarbons (propane, butane, and isobutane). Methane is the main component of natural gas (piped PNG/CNG), not bottled LPG. Carbon monoxide is a toxic combustion product, not a fuel component.

Step-by-Step Solution:

Verification / Alternative check:
Cylinder labels and national fuel standards specify propane–butane mixes (ratios tuned to season for vapor pressure control).

Why Other Options Are Wrong:

Common Pitfalls:
Confusing LPG with PNG/CNG; methane dominance implies pipeline or compressed natural gas, not bottled LPG.

Final Answer:
Propane and butane