In the given reaction `CH_3-CH_2-Broverset("Moist"Ag_2O)rarr[X]` [X] will be

Options

A. Ethanol
B. Diethyl ether
C. Propane
D. Propyne

Answer

To solve the question regarding the reaction of `CH3-CH2-Br` with moist `Ag2O`, we will follow these steps:

### Step 1: Understand the Reactants
We have an alkyl halide, `CH3-CH2-Br`, which is bromoethane. The presence of moist `Ag2O` indicates that water is involved in the reaction.

**Hint:** Identify the structure of the alkyl halide and the role of moist `Ag2O`.

### Step 2: Reaction of `Ag2O` with Water
Moist `Ag2O` reacts with water to form silver hydroxide (`AgOH`). This can be represented as:
\[ \text{Ag}_2\text{O} + \text{H}_2\text{O} \rightarrow 2 \text{AgOH} \]

**Hint:** Recognize that moisture (water) can lead to the formation of hydroxide ions.

### Step 3: Formation of Silver Bromide
In the presence of `Ag+` ions from `AgOH`, the bromoethane undergoes a reaction where the bromine atom is replaced by a hydroxyl group. The bromine ion (`Br-`) will react with `Ag+` to form silver bromide (`AgBr`), which precipitates out of the solution:
\[ \text{CH}_3\text{CH}_2\text{Br} + \text{Ag}^+ \rightarrow \text{CH}_3\text{CH}_2^+ + \text{AgBr} \]

**Hint:** Understand that the bromine atom is replaced by a hydroxyl group due to the formation of a carbocation.

### Step 4: Formation of Carbocation
The reaction leads to the formation of a carbocation (`CH3-CH2+`). This carbocation is unstable and will quickly react with the hydroxide ion (`OH-`) present in the solution.

**Hint:** Recognize the stability of carbocations and their tendency to react with nucleophiles.

### Step 5: Nucleophilic Attack by Hydroxide Ion
The hydroxide ion will perform a nucleophilic attack on the carbocation, resulting in the formation of ethanol:
\[ \text{CH}_3\text{CH}_2^+ + \text{OH}^- \rightarrow \text{CH}_3\text{CH}_2\text{OH} \]

**Hint:** Identify the nucleophile and the product formed from the nucleophilic attack.

### Step 6: Final Product
The final product of the reaction is ethanol (`CH3-CH2-OH`).

**Hint:** Confirm the structure of the final product and its classification.

### Conclusion
The product `[X]` in the reaction `CH3-CH2-Br + \text{Moist } Ag2O \rightarrow [X]` is ethanol (`CH3-CH2-OH`).