Ammonical cuprous chloride will give red precipitate with which one of the following

Options

A. `CH_3-C-=C-CH_3`
B. `CH_3-CH=CH_2`
C. `CH_3-C-=CH`
D. `CH_3-CH=CH-CH_3`

Answer

To solve the question regarding which compound will give a red precipitate with ammonical cuprous chloride, we can follow these steps:

### Step 1: Understand the Reactants
Ammonical cuprous chloride (Cu2Cl2 in the presence of NH4OH) is a reagent used to test for the presence of terminal alkynes. Terminal alkynes have a hydrogen atom attached to the carbon-carbon triple bond, making them reactive with this reagent.

### Step 2: Identify the Types of Alkynes
There are two types of alkynes:
- **Terminal Alkynes**: These have the triple bond at the end of the carbon chain (e.g., ethyne or propyne).
- **Non-terminal Alkynes**: These have the triple bond located within the carbon chain (e.g., butyne).

### Step 3: Reaction with Ammonical Cuprous Chloride
When terminal alkynes react with ammonical cuprous chloride, they form a complex that results in the formation of a red precipitate. This is due to the formation of cuprous acetylide, which is red in color.

### Step 4: Conclusion
Since the question asks for the compound that will give a red precipitate with ammonical cuprous chloride, the answer is **terminal alkynes**.

### Final Answer
Ammonical cuprous chloride will give a red precipitate with terminal alkynes.

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