Which of the following reaction will not give primary amine ?

Options

A. ` CH_(3)CONH_(2) overset(Br_(2)//KOH)to`
B. `CH_(3)CN overset(LiAIH_(4))to`
C. `CH_(3)NC overset(LiAIH_(4)) to`
D. ` CH_(3)CONH_(2) overset(LiAIH_(4))to`

Answer

To determine which of the following reactions will not give a primary amine, we will analyze each reaction step by step.

### Step 1: Analyze the first reaction
**Reaction:** CH3CONH2 (amide) + Br2 + KOH

This reaction is known as the Hofmann bromamide degradation reaction.

**Product:** The reaction will yield CH3NH2 (methylamine), which is a primary amine.

### Step 2: Analyze the second reaction
**Reaction:** CH3CN (methyl cyanide) + LiAlH4 (lithium aluminium hydride)

This reaction involves the reduction of a nitrile.

**Product:** The product of this reaction will be CH3CH2NH2 (ethylamine), which is also a primary amine.

### Step 3: Analyze the third reaction
**Reaction:** CH3NC (methyl isocyanide) + LiAlH4

In this case, we are reducing an isocyanide.

**Product:** The product formed will be CH3NHCH3 (dimethylamine), which is a secondary amine.

### Step 4: Analyze the fourth reaction
**Reaction:** CH3CONH2 (amide) + LiAlH4

This reaction involves the reduction of an amide.

**Product:** The product will be CH3CH2NH2 (ethylamine), which is a primary amine.

### Conclusion
From the analysis:

- The first reaction gives a primary amine (CH3NH2).
- The second reaction gives a primary amine (CH3CH2NH2).
- The third reaction gives a secondary amine (CH3NHCH3).
- The fourth reaction gives a primary amine (CH3CH2NH2).

Thus, the reaction that does not give a primary amine is the **third reaction** (CH3NC + LiAlH4), which produces a secondary amine.

### Final Answer
**The reaction that will not give a primary amine is option 3 (CH3NC + LiAlH4).**

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