Question

in which reaction is a small molecule formed from the atoms removed from a single reactant molecule? addition condensation elimination substitution

Explanation:

In an elimination reaction, a small molecule (like water, HCl etc.) is formed from the atoms removed from a single reactant molecule. In addition reactions, atoms are added to a molecule. In condensation reactions, two molecules combine with the loss of a small molecule. In substitution reactions, one atom or group is replaced by another.

Answer:

C. elimination