The-Organic-Chemistry-Tutor
The video explains that the boiling points of alkanes are affected by molecular weight and branching. Alkanes, being nonpolar, only have London dispersion forces which increase with molecular weight, hence, the higher the weight, the higher the boiling point. Conversely, molecular branching decreases Van der Waal forces, which reduces the boiling point. Using this information, it is concluded that octane, the alkane with the highest molecular weight and no branching, has the highest boiling point of the given options, while neopentane, the most-branched alkane, has the lowest boiling point.
In this section of the video, the speaker discusses the boiling points of alkanes and how they can be affected by molecular weight and branching. He explains that nonpolar molecules, like alkanes, only have London dispersion forces, which increase with molecular weight. Therefore, the higher the molecular weight, the higher the boiling point. Additionally, branching decreases the area of contact between molecules, which reduces Van Der Waal forces and ultimately the boiling point. Based on this information, he concludes that octane, a straight chain alkane with the highest molecular weight, has the highest boiling point of the given options, while neopentane, the most branched alkane, has the lowest boiling point.
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