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Line structures

Posted: Thu Mar 02, 2017 11:34 pm
by Jineava_To_3N
Can someone explain line structures when there are horizontal lines that vary in length? What is the purpose of these and how do I learn how to draw them? (For reference, I'm asking because the self-test 1.2B asks a question about the line structure for propyne.)

Re: Line structures

Posted: Fri Mar 03, 2017 12:11 am
by Marie_Bae_3M
I think if they vary in length they have to do with the number of bonds (ie: single, double, triple bonds). Triple bonds would be the shortest because the molecules bonded together are more firmly held together, therefore closer to each other, resulting in shorter bond length. However, I think in this case, the three lines just indicate a triple bond (I don't think there is a length variation?),because the question asks for an -yne organic molecule? So....... C =(triplebond)=C--C??