Name a hydrocarbon which will form a red precipitate with ammoniacal solution of copper (I) chloride.

Explanation

To answer the question regarding which hydrocarbon will form a red precipitate with ammoniacal solution of copper(I) chloride, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Hydrocarbon**: We need to find a hydrocarbon that reacts with ammoniacal copper(I) chloride (CuCl) to produce a red precipitate. The hydrocarbon in question is ethyne, also known as acetylene, which has the chemical formula C2H2.

2. **Understand the Reaction**: Ethyne reacts with ammoniacal copper(I) chloride in the following manner:
- The reaction involves the formation of copper acetylide (Cu2C2), which is the red precipitate.
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