Step 1: Boric acid (\( {B(OH)}_3 \)) contains hydroxyl groups, which are capable of forming hydrogen bonds.
Step 2: In the solid state, boric acid molecules tend to polymerize due to the formation of these hydrogen bonds between the hydroxyl groups of adjacent molecules. This network structure gives boric acid its polymeric nature.
Step 3: The polymerization is not due to its acidic nature or monobasic nature, but due to the intermolecular hydrogen bonding.