Which compound can form the greatest number of intermolecular hydrogen bonds per molecule in its pure liquid state?
CH3CH2OCH2CH3\text{CH}_3\text{CH}_2\text{OCH}_2\text{CH}_3CH3CH2OCH2CH3
CH3COCH3\text{CH}_3\text{COCH}_3CH3COCH3
CH3CH2CH2OH\text{CH}_3\text{CH}_2\text{CH}_2\text{OH}CH3CH2CH2OH
HOCH2CH(OH)CH2OH\text{HOCH}_2\text{CH(OH)CH}_2\text{OH}HOCH2CH(OH)CH2OH