Question

In which of the following I is more volatile than II?

• A.
• B.
• C. $\begin{array}{cc}\left(I\right)H_{2}O& \left(II\right)H_{2}S\end{array}$
• D. $\left(I\right)C{H}_{3}C{H}_2-OH\left(II\right)C{H}_3-O-C{H}_3$

Answer 1

Answer: (A), (B)

(a)
Intermolecular H - bonding makes boiling point higher than that of I. Thus, I is more volatile.
(b)


II. Intermolecular H - bonding makes boiling point higher than of intramolecular H-bonding. Thus, I is more volatile.

(c) Boiling point of $H_{2}O>>H_{2}S$ due to H- bonding
(d) Boiling point of $C{H}_{3}C{H}_{2}OH$ (due to H - bonding) $>>C{H}_3-O-C{H}_3$