Answer :
The first one is a synthesis reaction (A + B --> AB)
Second one is a double displacement (AB + CD --> AD + CB)
Third one is a synthesis
Fourth one is a single displacement (A + BC --> B + AC)
The fifth one is a decomposition (AB --> A + B). This is a reverse of synthesis.
Second one is a double displacement (AB + CD --> AD + CB)
Third one is a synthesis
Fourth one is a single displacement (A + BC --> B + AC)
The fifth one is a decomposition (AB --> A + B). This is a reverse of synthesis.