$t_{1/4}$ for a first-order reaction is given as:
- A$t_{1/4} = \frac{2.303}{K} \log 4$
- B$t_{1/4} = \frac{2.303}{K} \log 2$
- C$t_{1/4} = \frac{2.303}{K} \log \frac{4}{3}$
- D$t_{1/4} = \frac{2.303}{K} \log \frac{3}{4}$
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