Identify each of the C4H10O isomers on the basis of their 13C NMR spectra: (a) 18.9 ppm (CH3) (two carbons) (c) 31.2 ppm (CH3) (three

Identify each of the C4H10O isomers on the basis of their 13C NMR spectra:
(a) δ 18.9 ppm
(CH3) (two carbons)
(c) δ 31.2 ppm (CH3)
(three carbons)
δ 30.8 ppm (CH) (one carbon)
δ 68.9 ppm (C) (one carbon)

δ 69.4 ppm (CH2) (one carbon)
(b) δ 10.0 ppm (CH3)
δ 22.7 ppm (CH3)
δ 32.0 ppm (CH2)
δ 69.2 ppm (CH)