Check all of the statements that are true.

a. lighter compounds usually have greater dispersion forces than heavier compounds
b. compounds with hydrogen bonding usually have lower boiling points than similar compounds without hydrogen bonding
c. non-polar compounds usually have higher boiling points than polar compounds of similar mass
d. none of these statements are true

None of these statements are true

Explanation:

(a)

Heavier and large molecules or atoms exhibit greater dispersion force than lighter ones due to easily form temporary dipoles by large molecule.

(b)

Compounds with hydrogen bonding usually have higher boiling point than that of similar compound without hydrogen bonding,

Because boiling point of a compounds depends on force of attraction between the molecules.

(c)

Non polar compounds usually have lower boiling points than polar compounds of similar mass due to dipole dipole attractive force of polar compound.

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.