Answer :
Number 1: b) single replacement
Number 2: a) double replacement
Number 3 d) decomposition
Number 4: c) synthesis
Number 2: a) double replacement
Number 3 d) decomposition
Number 4: c) synthesis
Combination or
synthesis
A + B ----> AB
Decomposition AB ----> A + B
Substitution or Single Replacement A + BC ----> B + AC
Metathesis or Double Displacement AB + CD ----> AD + CB
Decomposition AB ----> A + B
Substitution or Single Replacement A + BC ----> B + AC
Metathesis or Double Displacement AB + CD ----> AD + CB