Question

rank these compounds by boiling point from highest to lowest boiling point: pentane, neopentane, hexane

rank these compounds by boiling point from highest to lowest boiling point: pentane, neopentane, hexane
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Answer #1
Concepts and reason

Boiling point of an alkane depends on its structure and molecule mass. Boiling point of alkanes with same molecular mass varies with their structure. A straight chain alkane will have higher boiling point than a branched-chain alkane of same molecular mass.

A straight alkane with greater molar mass will have higher boiling point than a straight chain alkane with lower molar mass.

Fundamentals

A straight chain alkane will have greater surface area contact than a branched-chain alkane. Due to greater surface area contact in straight chain alkane they will have greater van der Waals forces and high boiling point.

The structures of pentane and neopentane are as follows:

pentane
neopentane

Pentane is straight chain alkane and neopentane is branched chain alkane with same molar mass.

Following are structures of hexane and pentane:

hexane
pentane

Both pentane and hexane are straight chain alkanes. Hexane will have greater boiling point than pentane.

Ans:

Boiling point (BP) from highest to lowest is:

BP (hexane) > BP (pentane) > BP (neopentane)

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Answer #2

Boiling Point (hexane) > Boiling Point (pentane) > Boiling Point (neopentane)

answered by: Shivani Sharma
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