Which type of polymerization reaction involves the bonding of monomer molecules by the movement of electrons from a multiple bond into new single bonds between molecules?

The answer is addition polymerization.

That is addition polymerization is the type of polymerization reaction involves the bonding of monomer molecules by the movement of electrons from a multiple bond into new single bonds between molecules.

Addition polymerization reaction is the reaction in which bonding of monomer molecules takes places by the movement of electrons from a multiple bond into new single bonds between molecules.

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.