The following 1H NMR signals are for three molecules with ether functional groups. All the signals are

Question:

The following 1H NMR signals are for three molecules with ether functional groups. All the signals are singlets (single, sharp peaks). Propose structures for these compounds,
(a) C3H8O2, ( = 3.3 and 4.4 ppm (ratio 3:1);
(b) C4H10O3, ( = 3.3 and 4.9 ppm (ratio 9:1);
(c) C5H12O2, ( = 1.2 and 3.1 ppm (ratio 1:1).
Compare and contrast these spectra with that of 1,2-dimethoxyethane.