The reaction,
`CH_(3)CN+4H overset(Na//C_(2)H_(5)OH) to CH_(3)CH_(2)NH_(2)` is called

Options

A. Hofmann's bromamide reaction
B. Mendius reaction
C. Sabatier reaction
D. None of these

Answer

To solve the question regarding the reaction of `CH₃CN + 4H` in the presence of `Na/C₂H₅OH` to form `CH₃CH₂NH₂`, we will analyze the reaction step by step.

### Step 1: Identify the Reactants and Products
The reactants in the reaction are:
- `CH₃CN` (which is acetonitrile, containing a cyano group)
- `4H` (indicating the addition of hydrogen)

The product of the reaction is:
- `CH₃CH₂NH₂` (which is ethylamine, a primary amine)

### Step 2: Understand the Reaction Type
The reaction involves the reduction of a cyano group (`-C≡N`) to a primary amine (`-CH₂NH₂`). This is a characteristic reaction where a nitrile (cyano group) is converted into an amine through the addition of hydrogen.

### Step 3: Identify the Reaction Conditions
The reaction is carried out in the presence of sodium (`Na`) and ethanol (`C₂H₅OH`). Sodium acts as a reducing agent in this context, facilitating the hydrogenation of the cyano group.

### Step 4: Name the Reaction
This specific reaction, where a nitrile is reduced to a primary amine using sodium and ethanol, is known as the **Mendes reaction**.

### Conclusion
Thus, the reaction `CH₃CN + 4H` in the presence of `Na/C₂H₅OH` to form `CH₃CH₂NH₂` is called the **Mendes reaction**.

### Final Answer
The correct option is **B, Mendes reaction**.

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