Which of the following will not give positive chromyl chloride test?

Options

A. `CuCl_(2)`
B. `HgCl_(2)`
C. `ZnCl_(2)`
D. `C_(6)H_(5)NH_(3)^(+)Cl^(-)`

Answer

To determine which of the following compounds will not give a positive chromyl chloride test, we need to analyze each option: CuCl2, HgCl2, ZnCl2, and phenyl ammonium chloride.

### Step-by-Step Solution:

1. **Understanding the Chromyl Chloride Test**:
The chromyl chloride test involves the reaction of a compound with chromyl chloride (CrO2Cl2) to identify the presence of certain metal ions. Typically, this test is used to detect the presence of alkali and alkaline earth metals, as well as some transition metals.

2. **Analyzing Each Compound**:
- **CuCl2 (Copper(II) Chloride)**: This is a salt of copper, which can react with chromyl chloride and give a positive test.
- **HgCl2 (Mercuric Chloride)**: This is a covalent compound and does not produce mercuric ions (Hg²⁺) in the presence of chromyl chloride. Therefore, it will not give a positive chromyl chloride test.
- **ZnCl2 (Zinc Chloride)**: Zinc is a transition metal that can react with chromyl chloride and give a positive test.
- **Phenyl Ammonium Chloride**: This compound contains an ammonium ion and is not a metal salt that would react positively in the chromyl chloride test.

3. **Conclusion**:
Among the given options, **HgCl2 (Mercuric Chloride)** will not give a positive chromyl chloride test.

### Final Answer:
**HgCl2 (Mercuric Chloride)** will not give a positive chromyl chloride test.