Which of the following is an exampleof nucleophilic addition reaction ?

Options

A. `CH-=CH + Cl_(2) to CHCl=CHCl`
B. `HC-=CH overset(HCl)underset(CH_(3)COOH)to CH_(2)=CHCl`
C. `HC-=CH + H_(2)O underset(Hg^(2-), Delta)overset(H^(-))to CH_(3)-overset(O)overset(||)C-H`
D. `H-C-=C-H overset(NaNH_(2))to HC-=C^((-))Na^(o+)`

Answer

To determine which of the given options is an example of a nucleophilic addition reaction, we need to analyze each option based on the characteristics of nucleophilic addition reactions.

### Step-by-Step Solution:

1. **Understanding Nucleophilic Addition Reactions:**
- Nucleophilic addition reactions typically involve a nucleophile attacking an electrophilic carbon atom, often found in carbonyl compounds (like aldehydes and ketones). The nucleophile adds to the electrophilic carbon, leading to the formation of a new bond.

2. **Analyzing Each Option:**
- **Option 1:** CH≡CH (an alkyne) reacting with Cl2 to form CHCl=CHCl.
- This reaction is an electrophilic addition reaction, not nucleophilic addition, as the alkyne is reacting with an electrophile (Cl2).

- **Option 2:** Alkyne reacting with HCl.
- This is also an electrophilic addition reaction, where the alkyne acts as a nucleophile, but the mechanism is still electrophilic due to the presence of HCl.

- **Option 3:** Alkyne reacting with H2O to form an aldehyde.
- This is another example of electrophilic addition, where water acts as a nucleophile, but the overall mechanism is still classified as electrophilic addition.

- **Option 4:** Acetylene reacting with NaNH2 (sodamide) and H+.
- This is an acid-base reaction, not a nucleophilic addition reaction.

3. **Conclusion:**
- After analyzing all the options, none of them represent a nucleophilic addition reaction. The correct answer is that none of the provided options are examples of nucleophilic addition reactions.

### Final Answer:
- **None of the options provided are examples of nucleophilic addition reactions.**