Acetone

2-propanone. The simplest ketone.  Can be used as a polar aprotic solvent in nucleophilic substitution reactions (SN2) due to its lack of hydrogen bond donors and relatively high polarity (dielectric constant = 21, dipole moment = 2.88 D).  Relatively acidic (pKa 19) and undergoes keto-enol tautomerism. Cheap. Often used for cleaning glassware.

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