The homologue of ethyne is

Options

A. `C_2H_4`
B. `C_2H_6`
C. `C_3H_8`
D. `C_3H_4`

Explanation

To find the homologue of ethyne, we need to follow these steps:

### Step 1: Understand what ethyne is
Ethyne, also known as acetylene, is a hydrocarbon with the formula C2H2. It has a triple bond between the two carbon atoms.

### Step 2: Identify the concept of homologues
In organic chemistry, homologues are compounds that differ by a specific number of carbon and hydrogen atoms. For hydrocarbons, each successive homologue typically differs by a -CH2- group.

### Step 3: Determine the formula for the next homologue
Since ethyne (C2H2) has 2 carbon atoms, to find its homologue, we add one -CH2- group. This means we will add 1 carbon atom and 2 hydrogen atoms to the formula of ethyne.

### Step 4: Calculate the new formula
Starting from C2H2 (ethyne):
- Adding one carbon atom gives us C3.
- Adding two hydrogen atoms gives us H4.

Thus, the formula for the homologue of ethyne is C3H4.

### Step 5: Name the new compound
The compound with the formula C3H4 is known as prop-1-yne or methylacetylene. It has three carbon atoms and a triple bond, which is characteristic of alkynes.

### Final Answer
The homologue of ethyne is C3H4, which can be named prop-1-yne or methylacetylene.

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