Question

Which of the following molecules would be expected to have the lowest boiling point? A. NaF B. C2H2 C. MgO D. Na3P

Answer 1

The answer should be B because C2H2 is a covalent bond and covalent bonds have low boiling points

Answer 2

B.
`C_2H_2`

Step-by-step explanation:

The
`C_2H_2` is the only molecule that has covalent bonds (bond that occurs between two nonmetals), this means that the difference in electronegativity, of the molecule, is small, therefore it will not form a dipole.

Without dipole, the interaction is weaker, so less energy (heat) is required to break the covalent bonds than is required to break an ionic bond.

The other molecules have ionic bonds.