Final answer:
The line-angle formula for 1-bromo-2-methylpentane is drawn starting with a five-carbon zig-zag line for the pentane, with a line representing a bromine atom attached to the first carbon and another line representing a methyl group attached to the second carbon.
Step-by-step explanation:
To draw the line-angle formula for 1-bromo-2-methylpentane, first identify the parent chain, which is pentane, consisting of five carbon atoms.
In a line-angle formula, carbon atoms are not explicitly shown but are assumed to be at the ends and intersections of lines. Hydrogen atoms bonded to carbon are also not shown unless they're part of a functional group or necessary for clarity.
For the compound 1-bromo-2-methylpentane, begin by drawing a straight line with four vertices to represent the five carbon atoms of pentane. Since the bromine is attached to the first carbon, we draw a line branching from the first vertex to represent the bromine (Br) atom.
The methyl (CH3) group is attached to the second carbon, so we draw another line branching from the second vertex. The final line-angle formula will be a zig-zag line with a branch for the methyl group at the second carbon and a line indicating bromine at the first carbon.