The reduction of which of the following compound would yield secondary amine?

Options

A. Alkyl nitrile
B. Carbylamine
C. Primary amine
D. Secondary nitro compound

Answer

To determine which compound, when reduced, yields a secondary amine, we can follow these steps:

### Step 1: Understand the Types of Amines
Amines can be classified as primary, secondary, or tertiary based on the number of carbon groups attached to the nitrogen atom. A secondary amine has two carbon groups attached to the nitrogen.

### Step 2: Identify the Compounds
We need to analyze the given compounds to see which one can be reduced to form a secondary amine.

### Step 3: Recognize the Reduction Process
Reduction of certain compounds, such as isocyanides, can lead to the formation of secondary amines. Specifically, a carbamoyl compound (like isocyanide) when reduced can yield a secondary amine.

### Step 4: Apply Reduction to Methyl Isocyanide
For example, if we take methyl isocyanide (CS3N), and reduce it using lithium aluminum hydride (LiAlH4), the reaction can be represented as follows:

\[ \text{CS}_3\text{N} + \text{LiAlH}_4 \rightarrow \text{CS}_3\text{NH} + \text{other products} \]

This results in the formation of dimethylamine (CS3)2NH, which is a secondary amine.

### Step 5: Conclusion
Thus, the compound that yields a secondary amine upon reduction is methyl isocyanide (CS3N). Therefore, the correct option is option B.

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