Nitro, Nitroso, Nitrate, and Nitrite Compounds, Organic. Reactive groups are categories of chemicals that typically react in similar ways because they are similar in their chemical structure. Each substance with a chemical datasheet has been assigned to one or more reactive groups, and CAMEO Chemicals uses the reactive group assignments to make its reactivity predictions.
The largest  number that has a commonly-known specific name is a googolplex,  which is a 1 followed by a googol zeros, where googol is 10100 (a 1  followed by 100 zeros).
Most means the greatest number of something. An example of most is the ten people who decided to go to a party versus the four people who decided to stay home. 1  greatest in amount, quantity, or degree. 2  greatest in number.  in the greatest number of instances: most fame is fleeting.