# How can I determine NMR splitting pattern?

To find the NMR splitting pattern, for a given hydrogen atom, count how many identical hydrogen atoms are adjacent, and then add one to that number. For example, in $C {H}_{2} C l C {H}_{3}$ below, the red hydrogen atoms are adjacent to three identical hydrogen atoms (marked in blue). They will exhibit a quartet (4 peak; 3+1) splitting pattern. For the blue hydrogens, they are adjacent to two identical hydrogen atoms (marked in red), so their splitting pattern will be a triplet.
To illustrate this concept with one more example, with propane, $C {H}_{3} C {H}_{2} C {H}_{3}$. Each of the blue hydrogen atoms are still adjacent only to two identical hydrogen atoms, so they will still exhibit a triplet splitting pattern (2+1). This time, however, the red hydrogens are adjacent to six identical hydrogen atoms (with a symmetrical molecule such as propane, all the the blue hydrogen atoms are chemically identical). The resulting splitting pattern will be a seven-peaked septet (6+1).