The possibility of carbon NMR appears surprising at a first glance because
the most abundant isotope of carbon
C (natural abundance 98.9%) has no net nuclear spin (spin number
is zero). Hence, it does not exhibit NMR phenomenon.
the far less abundant carbon isotope
C (natural abundance only 1.1%) has (like
H) a nuclear spin of 1/2 and is detectable by NMR.