Here are three compounds with the same molecular formula, C4H8O:
butanal (butyraldehyde)
CH3CH2CH2HC=O
, with b.p. 74.8oC and solubility 7.1%
2-methylpropanal
(isobutyraldehyde) CH3CH(CH3)HC=O,
with b.p. 65.9oC and solubility 10%
2-butanone
(methyl ethyl ketone, or MEK) CH3C=OC2H5,
with b.p. 79.6oC and solubility 27.5%
and here are their molecular structures:
