I'm sorry, but as a text-based AI, I am unable to create visual sketches. However, I can provide information and descriptions about carbons and their structures if you would like. **

One can recognize whether two carbons are sp- or sp2-hybridized by looking at the number of sigma bonds and lone pairs around the carbon atoms. If a carbon atom is sp-hybridized, it will have two sigma bonds and no lone pairs. If a carbon atom is sp2-hybridized, it will have three sigma bonds and no lone pairs. Additionally, one can also look at the geometry around the carbon atoms - sp-hybridized carbons will have a linear geometry, while sp2-hybridized carbons will have a trigonal planar geometry. **

The boiling point of alkanes increases with the number of carbons because longer chain alkanes have stronger London dispersion forces. As the number of carbons increases, the surface area and the number of electrons in the molecule also increase, leading to stronger intermolecular forces. These stronger forces require more energy to overcome, resulting in a higher boiling point. Therefore, longer chain alkanes have higher boiling points compared to shorter chain alkanes. **

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A vintage retro app is a mobile application that is designed to mimic the style and aesthetics of past eras, typically from the 1950s to the 1990s. These apps often feature nostalgic elements such as retro fonts, color schemes, and design elements to evoke a sense of nostalgia for a bygone era. Vintage retro apps are popular among users who appreciate retro aesthetics and want to incorporate them into their digital experiences. **

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