Final answer:
The condensed line structure of (CH₃)₂CHCH₂CH₂CH₂COCH₃ represents a carbon chain with two methyl groups and a ketone functional group, where carbon atoms are at the ends and intersections of lines and hydrogens are not shown.
Step-by-step explanation:
The condensed line structure for the compound (CH₃)₂CHCH₂CH₂CH₂COCH₃ is a shorthand representation of its chemical structure without showing all the hydrogen atoms explicitly. The given structure describes a molecule with two methyl groups (CH₃) attached to the first carbon, followed by four methylene groups (CH₂), and ending with a ketone group (COCH₃). In a condensed line structure, carbon atoms are represented by the ends of lines or where lines intersect, and hydrogen atoms attached to the carbon atoms are not shown explicitly, while heteroatoms like oxygen are shown.