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The boiling points of alkanes increase with increase in molecular mass and for the same alkane, the boiling point decreases with branching. In the given question, all have the same number of C atoms but option 2 and 4 are branched compounds, hence, they will definitely have lower boiling point than butane and octane which are straight chain. Octane is a straight-chain compound that has a large surface area than butane. So, there are more van der Waals forces of attraction resulting in a high boiling point.
Match the following terms with their definitions in the context of environmental science:
What is "eutrophication" primarily associated with?
Where is the headquarters of the International Union for Conservation of Nature (IUCN) located?
The headquarters of the International Renewable Energy Agency (IRENA) is in which city?
Which city is home to the main offices of the United Nations Environment Programme (UNEP)?
Which layer of Earth's atmosphere is closest to the surface and contains most of the planet's mass of air?
Match the following environmental activists with their associated movements:
In the anaerobic digestion method of waste management:
Match the following terms with their appropriate impact on the environment:
What term is used to describe water that is safe and palatable for human consumption?
