Chemistry - CHEMICAL BONDING Question with Solution | TestHub
Select the correct order of boiling point -
Options:
Answer:
Solution:
The correct order of boiling point is (B) because of the differences in surface area and intermolecular forces between the two isomers of pentane.
Solution Breakdown
Surface Area: n-pentane (the straight chain) has a larger surface area compared to neopentane (the branched, spherical isomer).
Van der Waals Forces: A larger surface area allows for stronger London dispersion forces (Van der Waals forces) between molecules.
Boiling Point: Because n-pentane has stronger intermolecular attractions, it requires more energy to overcome them, resulting in a higher boiling point than the branched neopentane.
Other Options: (A) is wrong because CO is polar and has a higher BP than N₂. (C) is wrong as N(CH₃)₃ is larger and more polarizable than NF₃. (D) is wrong because larger molecules generally have higher boiling points.