The formulae for five compounds are given below: 1. $\text{C}_4\text{H}_{10}$ 2. $\text{C}_2\text{H}_5\text{OH}$ 3. $\text{C}_4\text{H}_9\text{OH}$ 4. $\text{C}_4\text{H}_9\text{COOH}$ 5. $\text{C}_5\text{H}_{11}\text{OH}$ Which of these compounds belong to the same homologous series?
- A1, 3 and 4 only
- B2, 3 and 5 only
- C3 and 4 only
- D3 and 5 only