The end product of the reaction
Ethyl amine `overset(HNO_(2))rarrAoverset(PCl_(3))rarrB(KCN)rarrC` is

Options

A. Ethyl amine
B. Diethyl amine
C. Propane nitrite
D. Triethyl amine

Explanation

To determine the end product of the reaction sequence involving ethyl amine, we will analyze each step of the reaction carefully.

### Step 1: Reaction of Ethyl Amine with HNO2
- **Starting Compound**: Ethyl amine (C2H5NH2)
- **Reaction**: Ethyl amine reacts with nitrous acid (HNO2).
- **Product Formation**: The amine group (NH2) is converted to an alcohol (OH) group, resulting in the formation of ethanol (C2H5OH).

**Product A**: Ethanol (C2H5OH)

### Step 2: Reaction of Product A with PCl3
- **Starting Compound**: Ethanol (C2H5OH)
- **Reaction**: Ethanol reacts with phosphorus trichloride (PCl3).
- **Product Formation**: The hydroxyl group (OH) in ethanol is replaced by a chlorine atom (Cl), leading to the formation of ethyl chloride (C2H5Cl).

**Product B**: Ethyl chloride (C2H5Cl)

### Step 3: Reaction of Product B with KCN
- **Starting Compound**: Ethyl chloride (C2H5Cl)
- **Reaction**: Ethyl chloride reacts with potassium cyanide (KCN).
- **Product Formation**: The chlorine atom (Cl) in ethyl chloride is replaced by a cyanide group (CN), resulting in the formation of propionitrile (C2H5CN).

**Product C**: Propionitrile (C2H5CN)

### Final Answer
The end product of the reaction sequence is **Propionitrile (C2H5CN)**.

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