Question

Which pairs of substances will dissolve in each other?

1) I. CH₃OH and II. C₆H₆
2) II. C₆H₆ and III. CH₃CH₃
3) I. CH₃OH and III. CH₃CH₃
4) All of the above

Answer 1

The only substances that will dissolve in each other among the given pairs are C₆H₆ (benzene) and CH₃CH₃ (ethane) due to their nonpolar nature.

Step-by-step explanation:

To determine which pairs of substances will dissolve in each other, we must consider the principle 'like dissolves like'. This means polar substances tend to dissolve in polar solvents, and nonpolar substances tend to dissolve in nonpolar solvents.

1. CH₃OH (methanol) and C₆H₆ (benzene): Methanol is polar due to its -OH group, while benzene is nonpolar. They are less likely to dissolve in each other.
2. C₆H₆ (benzene) and CH₃CH₃ (ethane): Both benzene and ethane are nonpolar, so they are likely to dissolve in each other.
3. CH₃OH (methanol) and CH₃CH₃ (ethane): Methanol is polar and ethane is nonpolar, making them unlikely to dissolve in each other.

Therefore, the only pair likely to dissolve in each other would be II. C₆H₆ and III. CH₃CH₃.