So just pick 1 hydrogen (any 1), then see how many chemically different hydrogens are 2-3 bond lengths from the one you picked
so for CH3CH2C(=O)H -- carbonyl at the end
so lets say the Hydrogens on the CH3 (left end) at all Hydrogen A's... the Hydrogens on CH2 (middle) are Hydrogen B's and the last one (far right near carbonyl) is Hydrogen C
Let's pick Hydrogen A:
- How many Hydrogen As are there? there are 3 hydrogen A's... therefore, the area/integral should be 3
- how many chemically different Hydrogens are next to the Hydrogen As within 3 bond lengths? There are 2 different ones (the two hydrogens attached to the carbon in the middle/the -CH2 group)
- therfore, number of peaks for hydrogen A = (2 chemically different Hydrogens) + 1 = 3 peaks/triplet
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