Read the statements about carbon and choose correct option.
A. It has small atomic size.
B. Its melting and boiling points are low as compared to other members of group.
C. It shows electropositive character.
D. It shows maximum tendency of catenation.

Options

A. A and B are correct.
B. B and D are correct.
C. A, C and D are correct.
D. A and D are correct.

Explanation

To solve the question about carbon and identify the correct statements, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement A: It has small atomic size.**
- Carbon (C) is located in Group 14 of the periodic table and is in the second period. As we move across a period from left to right, the effective nuclear charge increases, which pulls the electrons closer to the nucleus, resulting in a smaller atomic size. Therefore, this statement is **true**.

2. **Statement B: Its melting and boiling points are low as compared to other members of the group.**
- The members of Group 14 include carbon (C), silicon (Si), germanium (Ge), tin (Sn), and lead (Pb). Carbon has a relatively high melting point (around 3550 °C for diamond) compared to silicon and other group members. Thus, this statement is **false**.

3. **Statement C: It shows electropositive character.**
- Electropositive character refers to the ability of an element to lose electrons and form positive ions. Carbon is a non-metal and does not exhibit electropositive behavior; instead, it tends to gain or share electrons to form covalent bonds. Therefore, this statement is **false**.

4. **Statement D: It shows maximum tendency of catenation.**
- Catenation is the ability of an element to form long chains or rings by bonding with itself. Carbon has a strong ability to catenate due to its ability to form stable covalent bonds with itself. This property is more pronounced in carbon than in other elements of Group 14. Hence, this statement is **true**.

### Conclusion:
The correct statements about carbon are:
- Statement A: True
- Statement B: False
- Statement C: False
- Statement D: True

Thus, the correct options are A and D.