Hydrogen chloride gas dissolves in toluene (an organic liquid hydrocarbon). But this solution does not change blue litmus red. Why? 

Explanation

To understand why the solution of hydrogen chloride (HCl) in toluene does not change blue litmus paper red, we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Understanding Hydrogen Chloride (HCl)**:
- Hydrogen chloride is a gas that can dissolve in various solvents, including water and organic solvents like toluene.

2. **Dissolution in Water**:
...