Which compound has the greatest number of peaks (signals) in its 1H^1\text{H}1H NMR spectrum?
Diethyl ether, CH3CH2OCH2CH3\text{CH}_3\text{CH}_2\text{OCH}_2\text{CH}_3CH3CH2OCH2CH3
1,3-dichloropropane, ClCH2CH2CH2Cl\text{ClCH}_2\text{CH}_2\text{CH}_2\text{Cl}ClCH2CH2CH2Cl
Pentan-3-one, CH3CH2COCH2CH3\text{CH}_3\text{CH}_2\text{COCH}_2\text{CH}_3CH3CH2COCH2CH3
1-chloropropane, CH3CH2CH2Cl\text{CH}_3\text{CH}_2\text{CH}_2\text{Cl}CH3CH2CH2Cl