Which of the following hydrocarbons is an unsaturated compound? MCQ with Answer and Explanation

Explanation:
The enhanced greenhouse effect causing global warming is mainly due to rising CO₂ levels from fossil fuel combustion, deforestation, and industrial processes. Other GHGs like CH₄, N₂O, CFCs also contribute. Oxygen and nitrogen are not greenhouse gases. Argon is noble gas, inert. The atmospheric CO₂ has increased from ~280 ppm (pre-industrial) to over 420 ppm. This leads to climate change, sea level rise, and extreme weather.

Explanation:
A decomposition reaction is one where a single compound breaks down into two or more simpler substances. Heating potassium chlorate (KClO₃) breaks it down into potassium chloride and oxygen gas. A is combination, C is displacement, and D is double displacement.

Explanation:
Ethanol is a versatile solvent used in medicines like tinctures and perfumes. Ethanoic acid (glacial) can act as a solvent for many organic compounds. Ethyl ethanoate is an excellent solvent for fats, resins, and plastics, often used in nail polish removers and industrial paints.