The formation of large molecules from small repeating units is known as what kind of reaction? Oxidation reduction condensation hydrolysis

The formation of large molecules from small repeating units is known as Condensation reactions.

Explanation:

Those reactions in which two molecules join together with a elimination of small neutral molecule like H₂O, CH₃OH, HCl e. t. c are known as condensation reactions.

Polymerization reactions are those reactions in which small molecules called as monomers join together to form a large molecule also known as polymers. These reactions are done via different mechanisms among which one is the condensation reaction.

Example:

Proteins (polymer) are made up of amino acids (monomers) through condensation reaction as,

n H₂N-RH-COOH → H₂N-[-RH]n-COOH + n H₂O

In above equation "n" represent large number, H₂N-RH-COOH represent amino acid (monomer) and H₂N-[-RH]n-COOH represent protein (polymer). While, the H₂O eliminated is the small neutral molecule.