How many signals does one expect in the proton decoupled ¹³C NMR spectrum of o-xylene?

Name: How many signals does one expect in the proton decoupled 13 C NMR spectrum of o-xylene?
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The proton decoupled spectrum eliminates the couplings between the hydrogens, so we only expect to see signals for each unique carbon environment. In o-xylene, there are four unique carbon environments: two methyl groups (S1), one methylene group (S1), and one benzene ring (P), giving a total of four signals.

How Many Signals Does One Expect in the Proton Decoupled