00:01
Solving problem 27 of chapter 15.
00:04
Look at the five resonant structures for a phenotrin, problem 15 .26, and predict which of its carbon carbon bond is shortest.
00:17
So the five resonant structures are these.
00:22
In order to identify which of the carbon carbon bond is the shortest, first of all, let's number the carbons.
00:30
We can do it in this way.
00:31
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 and 14.
00:54
Ok.
00:55
Now, in order to see which one is the shortest, basically we need to identify which one as more double -bound character, which means which one occurs.
01:07
Of course, more times than the other as a double bond, meaning, for example, if we take a bond between carbon 1 and carbon 2, it's right here 2, in here appear as a double bond, in here appears a double bond, no, and in here appears as a double bond.
01:32
So it's one, two and three times.
01:40
Then let's do the same for carbon two, three.
01:46
Bond two, three, sorry.
01:48
No, no, yes.
01:50
So one, two, two times.
01:55
Okay, then carbon, bond three, four...