Asingle displacement reaction is options:when two couples are dancing on the floor and they each swap partners. now both men are dancing with a new woman. when a couple is dancing on the floor and a single man comes up and asks to dance with the woman. then the woman starts dancing with a new partner and the original man is all alone.

Hi

The answer is option 2: when a couple is dancing on the floor and a single man comes up and asks to dance with the woman. Then the woman starts dancing with a new partner and the original man is all alone.

Explanation:

Single-replacement reaction or single displacement reactions are a type of chemical reactions in which a whole compound reacts with an element in such a way that the element takes place of one of the compound's own elements and sets it free.

For example:

                                      KBr + I -> K + IBr

Potassium Bromide + Iodine -> Iodine(i) Bromide +Potassium  

It is a very common reaction in which iodine reacts with potassium bromide and replaces the place of bromine of potassium bromide. Therefore it is called as single displacement reaction.

Hope it help!

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