Here's why:
* Chairs are typically seen as individual items. Unlike animals or other objects that naturally form groups, chairs are usually considered separately.
* The context matters. The best word to describe a group of chairs depends on the specific situation.
Here are some options based on context:
* Set: A set of dining chairs, a set of office chairs
* Collection: A collection of antique chairs
* Row: A row of theater seats, a row of chairs in a classroom
* Arrangement: An arrangement of chairs for a meeting
* Furniture: A piece of furniture, several pieces of furniture (which could include chairs)
So, while there isn't a single perfect collective noun, you can choose the most fitting word based on your specific situation.