ANSWER
High boiling point
OPTION D
Explanation:
Firstly, we need to know the meaning of an ionic compound
Ionic compounds: These are compounds that consist of ions held together by an electrostatic force. The compound is always neutral but contains a positively charged ion called the cation and a negatively charged ion called the anion. Ionic compounds have the following properties
• They have a high melting point
,
• They have a high boiling point
,
• They are usually soluble in water
,
• They conduct electricity when dissolved in water or melted
,
• They are usually crystalline solid
From the option provided, the only correct answer is; it has a high boiling point