`CH_(3) - C-= CH+ CH+2H_(2) underset(Delta )overset("Rancy Ni")to A`
product 'A' in the given reaction is _____.

Options

A. propene
B. Propane
C. ethane
D. butane

Answer

To solve the question, we need to analyze the given reaction step by step.

### Step 1: Identify the Reactants
The given reaction is:
\[ CH_3 - C \equiv CH + 2H_2 \]
This indicates that we have 1-butyne (or propine) as the starting material, which is an alkyne.

### Step 2: Understand the Reaction Conditions
The reaction is carried out in the presence of Raney nickel (a catalyst) and heat. Raney nickel is commonly used to catalyze the hydrogenation of alkynes to alkanes.

### Step 3: Hydrogenation of the Alkyne
When 1-butyne (propine) reacts with hydrogen gas in the presence of Raney nickel and heat, the alkyne undergoes hydrogenation. This means that hydrogen atoms will add across the triple bond of the alkyne.

### Step 4: Addition of Hydrogen
The reaction can be visualized as follows:
1. The triple bond (C≡C) in 1-butyne will convert to a double bond (C=C) after the first addition of hydrogen.
2. A second addition of hydrogen will convert the double bond to a single bond (C-C).

### Step 5: Determine the Product
After the complete hydrogenation of 1-butyne, the product formed is propane (C3H8). This is an alkane, which is the saturated form of the original alkyne.

### Final Answer
The product 'A' in the given reaction is **propane (C3H8)**.

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