To determine which compounds are most likely ionic, we need to analyze the properties provided for each compound:
1. Compound A:
- Melting Point: High
- Boiling Point: High
- Dissolve in Water: Yes
- Conduct Electricity: Yes
2. Compound B:
- Melting Point: Low
- Boiling Point: Low
- Dissolve in Water: Yes
- Conduct Electricity: Yes, but poorly
3. Compound C:
- Melting Point: Low
- Boiling Point: Low
- Dissolve in Water: Yes
- Conduct Electricity: No
4. Compound D:
- Melting Point: High
- Boiling Point: High
- Dissolve in Water: Yes
- Conduct Electricity: Yes
Characteristics of Ionic Compounds:
- Typically have high melting and boiling points due to the strong electrostatic forces between ions.
- Conduct electricity when dissolved in water because the ions become mobile.
- Dissolve in water as the ionic bonds are broken with the help of water molecules.
Analysis of Each Compound:
- Compound A:
With high melting and boiling points, and the ability to conduct electricity, compound A fits the profile of an ionic compound.
- Compound B:
Although it has low melting and boiling points, it can conduct electricity (though poorly). This indicates that in a dissolved state, it has ions that can move and conduct current. Therefore, it can still be considered ionic, albeit with some peculiar characteristics.
- Compound C:
It has low melting and boiling points and does not conduct electricity. This suggests that there are no free ions to carry the current, making it unlikely to be ionic.
- Compound D:
This compound has high melting and boiling points and conducts electricity, both of which are strong indicators of an ionic nature.
From the above analysis:
- Compounds A and D are strong candidates for being ionic due to their high melting and boiling points and their ability to conduct electricity.
- Compound B might be considered ionic because it can conduct electricity, even though it has low melting and boiling points. Its inclusion is less certain compared to A and D.
- Compound C is unlikely to be ionic due to its inability to conduct electricity.
Based on these findings, the compounds most likely to be ionic are:
Compounds D and A.
Therefore, the correct answer is:
Compounds D and A.
