The correct statements among the following is:
| (a) | Catalyst provides an alternative pathway to the reaction mechanism |
| (b) | Catalyst raises the activation energy |
| (c) | A catalyst lowers the activation energy |
| (d) | Catalyst alters enthalpy change of the reaction |
| 1. | (a, b) | 2. | (b, c) |
| 3. | (c, d) | 4. | (a, c) |
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