Which compound has the greatest number of peaks (signals) in its 1H^1\text{H}1H NMR spectrum?
Methyl propanoate, CH3CH2COOCH3\text{CH}_3\text{CH}_2\text{COOCH}_3CH3CH2COOCH3
Propyl ethanoate, CH3COOCH2CH2CH3\text{CH}_3\text{COOCH}_2\text{CH}_2\text{CH}_3CH3COOCH2CH2CH3
Dimethyl carbonate, CH3OCOOCH3\text{CH}_3\text{OCOOCH}_3CH3OCOOCH3
Diisopropyl ether, (CH3)2CHOCH(CH3)2(\text{CH}_3)_2\text{CH}\text{OCH}(\text{CH}_3)_2(CH3)2CHOCH(CH3)2