The trend in electronegativity is f > cl > br; therefore, the most ionic compound (ch2f2) has the lowest boiling point, and the most covalent compound (ch2br2) has the highest boiling point. true or false?

False

Explanation:

Increase in polarity of a molecule leads to higher boiling points. The more polar a molecule is, the higher the energy required to breaks intermolecular forces of attraction hence the higher the boiling point. This is the reason why ionic compounds and compounds having polar covalent bonds in them tend to have high boiling points.

a electronegativity decreases beacuse the size of nucleus is bigger.