What kind of chemical reaction is synthesis ? Choose the correct option(s) for its explanation:

Complex products are formed.

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Reactants are always elements.

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Reactants are always compounds.

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It is a type of combination reaction.

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Solution

The correct options are
A Complex products are formed.
D It is a type of combination reaction.
A synthesis reaction or direct combination reaction is a type of chemical reaction in which two or more simple substances combine to form a more complex product. The reactants may be elements or compounds. The product is always a compound.
The general form of a synthesis reaction is:
A + B $\to$ AB

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