Give the structural formulae of the first four mem-bers of homologous series of alkanes ,alkense and alkynes .

Explanation

To solve the question regarding the structural formulae of the first four members of the homologous series of alkanes, alkenes, and alkynes, we will follow these steps:

### Step 1: Identify the General Formulas
1. **Alkanes**: The general formula for alkanes is \( C_nH_{2n+2} \).
2. **Alkenes**: The general formula for alkenes is \( C_nH_{2n} \).
3. **Alkynes**: The general formula for alkynes is \( C_nH_{2n-2} \).

### Step 2: Determine the First Four Members of Each Series
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