00:01
When it comes to proton acidity, protons on sp carbons are more acidic than those on sp2, which are more acidic than those on sp3.
00:15
So as we inspect the structures, roman numerals 1, 2, and 3 have protons on sp3 carbons, whereas roman numeral 4 is sp2, roman numeral 5 is spp.
00:34
So the compound 5 will be the most acidic of the set, but we're looking for the least acidic, so we can eliminate five.
00:45
And by the same token, we can eliminate four because protons on sp2 carbons on sp2 carbons are more acidic than protons on sp3.
00:58
So now we are down to three choices.
01:06
And a couple ways to think about the relative acidity.
01:14
One is the ease with which a base can pull off the proton...