00:02
This is the answer to chapter 17, problem number seven from the smith organic chemistry textbook.
00:09
And this problem asks us how many carbon 13 nmr signals does each compound exhibit? and so hopefully everybody remembers that unique carbons are going to give rise to unique signals.
00:31
And carbons that are equivalent to other carbons in the molecule are not going to give a unique signal.
00:41
So there will be one signal for each unique type of carbon in each of these molecules.
00:47
And so all that we really need to do is count the number of unique carbons.
00:51
So for a, we have one, two, three, four, five, five, six so there are going to be six signals for a and just to clarify this carbon will be the same as one and this carbon will be the same as two and so that's why they don't give their own signals so looking at b every single one of these carbons is unique so one two three four five six seven.
01:34
And so for b, we expect there to be seven different signals.
01:43
And then looking at c, we have one, two, three, four...