The term aldol condensation has to do with a reation in which a nucleophile attacks the carbonyl group of an aldehyde.
<h3>What is alodol condensation?</h3>
The term aldol condensation has to do with a reation in which a nucleophile attacks the carbonyl group of an aldehyde or a ketone to convert it to the enolate from which attacks another aldehyde or ketone at the carbonyl carbon to form the required product.
The structure of the organic product from the aldol condensation involving cyclopentanone is shown in the image attached to this answer.
A chemical reaction is the change in chemical form rather than physical due to an outside force. This can come from something as simple as a change in temerature to as large as a specific element or compound.