Propane (molar mass 44.11 g/mol) boils at -42.1°C. Ethanol has almost the same molar mass (46.07 g/mol), but boils at 78.5°C. Which of the following BEST explains the reason for the large discrepancy in boiling point?
A. Â Â Propane is ionic and, therefore, has a lower boiling point.
B. Â Â Ethanol is ionic and, therefore, has a higher boiling point.
C. Â Â Both compounds only exhibit van der Waals forces.
D. Â Â Both compounds are polar. Ethanol is more polar than Propane.
E. Â Â Ethanol exhibits hydrogen bonding.
F. Â Â Propane exhibits hydrogen bonding.
Solution
ethanol is having high boiling point than propane
because in ethanol, the -OH group can form intermolecular hydrogen bonding. so there is association of molecules
which it leads to greater boiling point.
whereas in case of propane, no such hydrogen bonding is possible.
.
Web & Social Media Analytics Previous Year Question Paper.pdf
Propane (molar mass 44-11 g-mol) boils at -42-1C- Ethanol has almost t.docx
1. Propane (molar mass 44.11 g/mol) boils at -42.1°C. Ethanol has almost the same molar mass
(46.07 g/mol), but boils at 78.5°C. Which of the following BEST explains the reason for the
large discrepancy in boiling point?
A. Â Â Propane is ionic and, therefore, has a lower boiling point.
B. Â Â Ethanol is ionic and, therefore, has a higher boiling point.
C. Â Â Both compounds only exhibit van der Waals forces.
D. Â Â Both compounds are polar. Ethanol is more polar than Propane.
E. Â Â Ethanol exhibits hydrogen bonding.
F. Â Â Propane exhibits hydrogen bonding.
Solution
ethanol is having high boiling point than propane
because in ethanol, the -OH group can form intermolecular hydrogen bonding. so there is
association of molecules
which it leads to greater boiling point.
whereas in case of propane, no such hydrogen bonding is possible.
