In the following pairs of halogen compounds, which compound undergoes faster SN1 reaction?

The correct option is:
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| 4. | ![]() |

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| 3. | ![]() |
| 4. | None of the above |
| 1. | 1-Chloropropane < Isopropyl chloride < 1-Chlorobutane |
| 2. | Isopropyl chloride <1-Chloropropane < 1-Chlorobutane |
| 3. | 1-Chloropropane < 1-Chlorobutane < Isopropyl chloride |
| 4. | None of the above |
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2. | ![]() |
| 3. | ![]() |
4. | None of the above |
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2. | ![]() |
| 3. | ![]() |
4. | None of the above |
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| 2. | ![]() |
| 3. | ![]() |
| 4. | None of the above |
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2. | ![]() |
| 3. | ![]() |
4. | None of the above |
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2. | ![]() |
| 3. | ![]() |
4. | None of the above |