Which compound has the highest boiling point?
CH3CH2CH2CH2OH\text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{OH}CH3CH2CH2CH2OH
CH3CH2CH2CHO\text{CH}_3\text{CH}_2\text{CH}_2\text{CHO}CH3CH2CH2CHO
CH3CH2COCH3\text{CH}_3\text{CH}_2\text{COCH}_3CH3CH2COCH3
CH3COOCH2CH3\text{CH}_3\text{COOCH}_2\text{CH}_3CH3COOCH2CH3