Question
Saturated hydrocarbons are classified into three types. Write these names giving one example each.

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| Column 1 | Column 2 | Column 3 |
| Farsightedness | Nearby object can be seen clearly | Bifocal lens |
| Presbyopia | Faraway object can be seen clearly | Concave lens |
| Nearsightedness | Problem of old age | Convex lens |
| Element | Atomic radius (pm) |
| O | 66 |
| B | 88 |
| C | 77 |
| N | 74 |
| Be | 111 |
| Li | 152 |