Which of the following statements is correct?
| a. | Elements of group 15 form electron deficient hydrides |
| b. | All elements of group 14 form electron precise hydrides |
| c. | Electron precise hydrides have tetrahedral geometries. |
| d. | Electron rich hydrides can act as Lewis acids. |
Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
