An isocyanide on reduction with hydrogen in the presence of Pt gives

Options

A. amide
B. primary amine
C. secondary amine
D. alcohol.

Explanation

To solve the question, "An isocyanide on reduction with hydrogen in the presence of Pt gives what?", we can follow these steps:

### Step 1: Understand the Structure of Isocyanide
Isocyanides (or isocyanates) have the general formula R-N≡C, where R is an alkyl or aryl group. The nitrogen is connected to a carbon atom via a triple bond.

**Hint:** Recall that isocyanides have a characteristic structure with a nitrogen atom triple-bonded to carbon.

### Step 2: Identify the Reduction Reaction
When isocyanides undergo reduction, they react with hydrogen in the presence of a catalyst (in this case, platinum). This process typically involves the breaking of the triple bond between nitrogen and carbon.

**Hint:** Remember that reduction generally involves the addition of hydrogen or the removal of oxygen.

### Step 3: Analyze the Products of Reduction
During the reduction of isocyanides, the triple bond (C≡N) is converted to a single bond (C-N). The nitrogen atom will typically gain hydrogen atoms, resulting in the formation of an amine.

**Hint:** Think about how the addition of hydrogen affects the bonds in the molecule.

### Step 4: Determine the Type of Amine Formed
The product formed from the reduction of an isocyanide will be a secondary amine. This is because the nitrogen atom in the product will be bonded to two carbon atoms (one from the original isocyanide and one from the hydrogen added during reduction).

**Hint:** Consider the classification of amines: primary amines have one carbon attached to nitrogen, secondary amines have two, and tertiary amines have three.

### Step 5: Write the Final Product
If we take a specific example of an isocyanide, say methyl isocyanide (CH3-N≡C), upon reduction, it will yield methylamine (CH3-NH2) as the product, which is a secondary amine.

**Hint:** Visualize the structure of the product to confirm the number of carbon atoms attached to the nitrogen.

### Conclusion
Thus, the final answer is that an isocyanide on reduction with hydrogen in the presence of platinum gives a secondary amine.

**Final Answer:** Secondary amine.