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This is the answer to chapter one, problem number 73, from the smith organic chemistry textbook.
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And we are asked to look at two series of bonds and talk about, compare them in terms of length.
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And so part a here is actually in order.
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So remember, a triple bond is going to be shorter.
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Than a double bond, which will be shorter than a single bond.
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So the triple bond is going to be the shortest.
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Double is going to be intermediate to a triple and a single, and then a single bond is going to be the longest.
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So part a is pretty straightforward.
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So for part b here, we have to look at these three bonds within the same molecule.
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To make this comparison, we need to look at the hybridization.
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Of the carbons.
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So each of these is a carbon -hydrogen bond, and it's going to come down to the hybridization of the carbons, and therefore the percent s -character of the bond.
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So the first one, the carbon, that's part of this bond that we're looking at, has a triple bond to another carbon...