In general boiling point of covalent compounds is affected due to increasing molecular weight and hy β Chemical Bonding Chemistry Question
Question
In general boiling point of covalent compounds is affected due to increasing molecular weight and hydrogen bonding. Thus it is observed that the boiling point of octanol is greater that water while that of methanol is lesser than water. The other properties which are considerably affected due to hydrogen bond formation are acidic nature, melting point, anamalous behaviour of water below 4Β°C., It is therefore concluded that hydrogen bonding plays a vital role in explaning many observable facts.
π‘ Solution & Explanation
Step 1: Determine the number of Ο-bonds in each thionic/sulfur oxyacid species by drawing their Lewis structures to satisfy octets/valencies (S exhibits variable valency up to 6). Step 2: Calculate the Ο-bonds: (II) H2S2O3 has 2 Ο-bonds; (III) H2S2O5 has 3 Ο-bonds; (I) H2S2O6 has 4 Ο-bonds. Step 3: Order the compounds by increasing number of Ο-bonds: II (2) < III (3) < I (4), which corresponds to option (c).