Multiple Line Structures

[Kevin_Li_2F]

When drawing line structures, what makes one line structure more valid/correct than another? For example...


All represent 3,3-dimethylpentane, yet each differ slightly by bond angle or whether a line turns up or down.

Is there a standardized correct method for these line structures? For example I've noticed that when 3 lines come together, they tend to do so at congruent 120 degree angles, and 90 degrees for four lines.

[Shailyn_Moore_3C]

You want to make your line structures still indicative of the bond angles. So this goes back to chem 14a so for example when you have a trigonal planar shape your angles will be close to 120 degrees.