The CH bond in acetone, (CH3)2CO, has a pKa of 19.2. Draw two resonance structures for its conjugate base. Then, explain why acetone is much more acidic than propane, CH3CH2CH3 (pKa = 50).

The negative charge on acetone’s conjugate base is stabilized by resonance.

Explanation:

The resonance structures with negative charge on Carbon and Oxygen  is shown in the attached file. Please refer the attached file.

Since the negative charge on acetone's conjugate base is stabilized by resonance structure that is not possible in propane since there is no double bond or an atom with lone pair of electrons.

Thus, the answer is – The negative charge on acetone’s conjugate base is stabilized by resonance.

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa

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