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).
Infinity is an idea, so we can't say that it's the largest number possible. If we're talking about named numbers (like million, billion, trillion) then one of the biggest we can talk about is a googol. A googol is 1.0 x 10100 - which is a scientific way of writing a one followed by 100 zeros.