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Which has the correct descending order of Inhibitory Capacity?

(a) Propionic > Butyric > Acetic > Lactic

(b) Propionic > Acetic > Butyric > Lactic

(c) Lactic > Butyric > Acetic > Propionic

(d) Lactic > Acetic > Butyric > Propionic

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The correct option is (a) Propionic > Butyric > Acetic > Lactic

The explanation: pKa values of Propionic, Butyric, Acetic and Lactic are 4.88, 4.82, 4.76 and 3.85 respectively.

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