Which list of solutions is arranged in order from highest boiling point to lowest boiling point?

In determining the boiling point of solutions, always take note of the number of ions that will dissociate in the solution. It does not depend on the nature of the substance. The greater the number of ions dissociated, the greater is the boiling point of the solution. 

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).