# What is the process of connecting two molecules under removal of one molecule of water?

Certain molecules can be joined by the removal of water in a process called:

1. Hydration.

2. Hydrolysis.

3. Neutralization.

4. Condensation.

I know that the process of hydration is defined as, "A compound produced by combining a substance chemically with water."

The process of hydrolysis is defined as, "The chemical breakdown of a compound due to reaction with water."

Neutralization is a chemical reaction in which an acid and a base react quantitatively with each other.

Condensation is the conversion of a vapor or gas to a liquid.

The answer is most likely (1), but I'd like some feedback and explanation of these definitions!

• Not that kind of condensation. – Mithoron Oct 15 '16 at 23:50
• Oops, then what is it? – 关一骏 Oct 15 '16 at 23:53
• Is this an example of a condensation reaction? A simple example is the condensation of two amino acids to form a peptide. – 关一骏 Oct 15 '16 at 23:56

Note that in many to most processes, the water exclusion is entirely formal and what actually is excluded is something like $\ce{H2PO4-}$.