Which of the following is not one of the five general types of reactions?
a. synthesis
c. single replacement
b. decomposition
d. recomposition

The correct answer among the choices given is option D. Recomposition is not one of the five general types of reactions. I think is not one type reaction even. The types of reaction includes synthesis, single replacement, decomposition, double-replacement and combustion.

The answer is d. recomposition

Explanation:

Chemical reactions are classified in five basic types of reactions:

Combination or synthesis reaction: Is a reaction in which two or more substances combine to form a single new substance:    A + B → CDecomposition reaction: Is a reaction in which a compound fragment in two or more simpler substances: AB → A + BSingle-Replacement reaction: Is a reaction in which one element replaces a similar element in a compound: AB + C → AC + BDouble-Replacement reaction: Is a reaction in which the positive and negative ions of two ionic compounds exchange places to form two new compounds: AB + CD → AD + CBCombustion reaction: Is a reaction in which a compound reacts with oxygen producing energy as light or heat. The combustion of methane  is one of the most common reaction: CH₄ + ³/₂ O₂ → CO₂ + 2 H₂O + Δ

The recomposition reaction doesn't exist.