Final answer:
The condensed structural formula for 2,2-dimethylbutane is CH3C(CH3)2CH2CH3 or (CH3)3CHCH3.
Step-by-step explanation:
The condensed structural formula for 2,2-dimethylbutane is CH3C(CH3)2CH2CH3. In this formula, each letter represents a carbon atom, and the numbers inside the parentheses indicate how many hydrogen atoms are bonded to each carbon. The condensed structural formula can also be written as (CH3)3CHCH3.