Atmospheric pressure decreases as altitude increases. in other words, there is more air pushing down on you at sea level, and there is less air pressure pushing down on you when you are on a mountain. if pentane (c5h12), heptane (c7h16), and heptanol (c7h15oh) are heated evenly at different altitudes, rank them according to the order in which you would expect them to begin boiling. rank from first to last. to rank items as equivalent, overlap them.

Explanation:

It is known that stronger is the bonding between the atoms of a molecule more difficulty it will face to form vapors. Hence, more heat needs to be provided to the molecule. As a result, it will have high boiling point.

So, in heptanol there is hydrogen bonding. Hence, there is strong bonding so, boiling point of heptanol will be high.

On the other hand, heptane has long carbon chain as compared to pentane. Therefore, heptane will occupy more surface area and thus, more heating will be provided to it. Hence, boiling point of heptane will be greater than the boiling point of pentane.

Thus, we can conclude that rank of given compounds according to start of their boiling point is as follows.

                     pentane < heptane < heptanol

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