Hyperconjugation occurs among the following compounds:
| 1. | I only | 2. | II only |
| 3. | III only | 4. | I and III |
What is the correct sequence of acidity for the following compounds?
| 1. | CH3COOH > BrCH2COOH > ClCH2COOH > FCH2COOH |
| 2. | FCH2COOH > CH3COOH > BrCH2COOH > ClCH2COOH |
| 3. | BrCH2COOH > ClCH2COOH > FCH2COOH > CH3COOH |
| 4. | FCH2COOH > ClCH2COOH > BrCH2COOH > CH3COOH |