Which pair will form ideal solution ?

Options

A. n-hexane+hexanol
B. hexanol+pentanone
C. n-butane+isobutane
D. butan-1-ol-+methanol

Answer

To determine which pair will form an ideal solution, we need to understand the characteristics of ideal and non-ideal solutions. Here’s a step-by-step solution:

### Step 1: Understand the Definition of Ideal Solution
An ideal solution is one that obeys Raoult's law throughout the entire concentration range. This means that the intermolecular forces between the solute and solvent molecules are similar to those between the solvent molecules themselves.

**Hint:** Remember that for a solution to be ideal, the interactions between all types of molecules (solute-solute, solute-solvent, and solvent-solvent) should be similar.

### Step 2: Analyze the Given Options
We are given several pairs of substances, and we need to evaluate each pair to determine if they will form an ideal solution.

1. **n-Hexane and Hexanol**:
- n-Hexane is nonpolar, while hexanol is polar. The difference in polarity suggests that they will not interact similarly, leading to a non-ideal solution.

**Hint:** Mixtures of polar and nonpolar substances typically do not form ideal solutions.

2. **Hexanol and Pentanol**:
- Both hexanol and pentanol are polar alcohols. However, due to differences in molecular structure and size, they may not interact ideally, leading to a non-ideal solution.

**Hint:** Even if both substances are polar, differences in their molecular structure can lead to non-ideal behavior.

3. **n-Butane and Isobutane**:
- Both n-butane and isobutane are nonpolar hydrocarbons. Their similar molecular characteristics suggest that they will interact similarly, thus forming an ideal solution.

**Hint:** Similar types of molecules (both nonpolar or both polar) are more likely to form ideal solutions.

4. **Butane-1-ol and Methanol**:
- Both butane-1-ol and methanol are polar. However, due to differences in their molecular structures and the presence of different functional groups, they are likely to exhibit non-ideal behavior.

**Hint:** Even when both components are polar, structural differences can lead to non-ideal interactions.

### Step 3: Conclusion
Based on the analysis, the only pair that forms an ideal solution is **n-butane and isobutane**.

**Final Answer:** The pair that will form an ideal solution is **n-butane and isobutane**.