Question

Which of the following compound will have highest boiling point ?

• A. Water
• B. Ethanol
• C. Methanol
• D. Dimethylethene

Answer 1

The correct option is A Water

Water will have highest boiling point as it forms strong intermolecular hydrogen bonds. Ethanol and methanol also forms strong intermolecular hydrogen bonds but the number of intermolecular hydrogen bonds per molecule is twice for water than for ethanol and methanol. This is because, in water, 2 $H$ atoms are attached to electronegative oxygen atom however in ethanol and methanol, only one $H$ atom is attached to oxygen atom.