00:03
This is the answer to chapter 22, problem number 87, from the smith organic chemistry textbook.
00:12
And this problem says the proton -en -r spectrum of two chloroacetamide shows three signals at 4 .02, 7 .35, and 7 .60 ppm.
00:23
What protons give rise to each signal? explain why three signals are observed.
00:29
Okay.
00:29
Okay, so the 4 .02 ppm protons or ppm signal comes from these two protons.
00:42
And then the 7 .35 and 7 .60 ppm signals come from these two protons.
00:56
And the reason that three signals are observed instead of just two signals is because of the resonant structure for this amide that looks like this.
01:09
So the electrons move in the fashion that i just drew.
01:14
And so we get a resonant structure that looks like this.
01:31
Okay.
01:35
And so this structure contributes significantly...