MCQ
$t_{1/4}$ for first order reaction is given as
- A${t_{1/4}} = \frac{{2.303}}{K}\,\log \,4$
- B${t_{1/4}} = \frac{{2.303}}{K}\,\log \,2$
- ✓${t_{1/4}} = \frac{{2.303}}{K}\,\log \,\frac{4}{3}$
- D${t_{1/4}} = \frac{{2.303}}{K}\,\log \,\frac{3}{4}$
$\mathrm{t}_{1 / 4}=\frac{2.303}{\mathrm{k}} \log \frac{[\mathrm{A}]_{0}}{3[\mathrm{A}]_{0}} \times 4$
$t_{1 / 4}=\frac{2.303}{k} \log \frac{4}{3}$
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| Observation | $[A]$ | $[B]$ | Rate of reaction |
| $1$ | $0.1$ | $0.1$ | $2\times10^{-3}\, mol\, L^{-1}\,sec^{-1}$ |
| $2$ | $0.2$ | $0.1$ | $0.4\times10^{-2}\, mol\, L^{-1}\,sec^{-1}$ |
| $3$ | $0.1$ | $0.2$ | $1.4\times10^{-2}\, mol\, L^{-1}\,sec^{-1}$ |
$R - Br + C{l^ - }\xrightarrow{{DMF}}R - Cl + B{r^ - }$ ,
which one of the following undergoes complete inversion of configuration?