The melting point of Group `13` follows the order

Options

A. `B gt Al gt Ga gt In gt Tl`
B. `B gt Al lt Ga gt In gt Tl`
C. `B gt Al gt Tl gt In gt Ga`
D. `B gt Al lt Ga lt In lt Tl`

Explanation

To determine the melting point order of Group 13 elements, we need to analyze the trends in melting points of the elements in this group, which includes boron (B), aluminum (Al), gallium (Ga), indium (In), and thallium (Tl).

### Step-by-Step Solution:

1. **Identify the Elements in Group 13**: The elements in Group 13 of the periodic table are boron (B), aluminum (Al), gallium (Ga), indium (In), and thallium (Tl).

2. **Understand the General Trend**: Generally, in a group of the periodic table, the melting points tend to decrease as you move down the group. However, there are exceptions due to changes in structure and bonding.

3. **Analyze Boron**: Boron has a very high melting point compared to the other elements in the group due to its strong covalent network structure.

4. **Consider Aluminum**: Aluminum has a relatively high melting point as well, but it is lower than that of boron.

5. **Examine Gallium**: Gallium has a unique structure and a lower melting point than both boron and aluminum. It has a melting point that is lower than expected due to its metallic bonding and the presence of a more complex crystal structure.

6. **Look at Indium and Thallium**: Indium has a higher melting point than gallium but lower than aluminum. Thallium, on the other hand, has a melting point that is lower than that of indium.

7. **Establish the Correct Order**: Based on the analysis, the correct order of melting points from highest to lowest is:
- Boron (highest)
- Aluminum
- Thallium
- Indium
- Gallium (lowest)

8. **Conclusion**: Therefore, the correct order of melting points for Group 13 elements is:
- Boron > Aluminum > Thallium > Indium > Gallium

### Final Answer:
The melting point of Group 13 follows the order: Boron > Aluminum > Thallium > Indium > Gallium.