Question

The boiling point of methanol, water and dimethyl ether are respectively ${65}^{0}C,{100}^{0}Cand{34.5}^{0}C$. Which of the following best explains these wide variations in b.p.?

• A. The molecular mass increases from water (18) to methanol (32) to diethyl ether (74)
• B. The extent of H-bonding decreases from water to methanol while it is absent in ether
• C. The extent of intramolecular H-bonding decreases from ether to methanol to water
• D. The density of water is $1.00gm{l}^{-1}$, methanol $0.7914gm{l}^{-1}$ and that of diethyl ether is $0.7137gm{l}^{-1}$

Answer 1

The correct option is B

The extent of H-bonding decreases from water to methanol while it is absent in ether

Water has strongest hydrogen bond of the three