How would you verify the completion of the following reaction by IR spectroscopy? 
Definitions:
Body Weight
The measure of a person's mass or heaviness.
Lactose
A disaccharide sugar composed of glucose and galactose, found in milk.
Ductus Arteriosus
Fetal vessel connecting the left pulmonary artery with the descending aorta.
Pulmonary Trunk
Large, elastic artery that carries blood from the right ventricle of the heart to the right and left pulmonary arteries.
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