The reduction of a nitrile by LiAlH_( 4 ) produes :

Options

A. Primary amine
B. Secondary amine
C. Tetiary amine
D. Amide

Answer

To solve the question regarding the reduction of a nitrile by LiAlH₄, we can follow these steps:

### Step 1: Understand the Structure of Nitrile
Nitriles are organic compounds that contain a cyano group (−C≡N). They can be represented as R-C≡N, where R is an alkyl or aryl group. For example, if we take butyronitrile, its structure can be represented as CH₃-CH₂-CH₂-C≡N.

**Hint:** Remember that the cyano group is a triple bond between carbon and nitrogen.

### Step 2: Identify the Reduction Process
When a nitrile is reduced, it typically undergoes a transformation where the cyano group is converted into an amine. Lithium aluminum hydride (LiAlH₄) is a strong reducing agent that can reduce nitriles to primary amines.

**Hint:** Focus on the reducing agent used and its ability to convert functional groups.

### Step 3: Write the Reaction
The reduction of a nitrile with LiAlH₄ can be represented as follows:
\[ R-C≡N + 4[H] \xrightarrow{LiAlH₄} R-CH₂-NH₂ \]

In this reaction, the cyano group (−C≡N) is reduced to a primary amine (−CH₂-NH₂).

**Hint:** Keep track of the number of hydrogen atoms added during the reduction.

### Step 4: Determine the Product
From the reaction, we see that the product formed is a primary amine. This is because the reduction of the nitrile introduces one carbon atom (from R) and one amine group (−NH₂) to the structure.

**Hint:** Recall that primary amines have the general formula R-NH₂, where R is an alkyl or aryl group.

### Step 5: Conclusion
Thus, the reduction of a nitrile by LiAlH₄ produces a primary amine.

**Final Answer:** The product of the reduction of a nitrile by LiAlH₄ is a primary amine.

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