$\mathrm{R} \rightarrow \mathrm{P}$ is a first order reaction. For this reaction a graph of $\ln [\mathrm{R}]$ (on y -axis) and time (on $x$-axis) gave a straight line with negative slope. The intercept on $y$-axis is equal to $(\mathrm{k}=$ rate constant $)$

• Correct answer
  A

  $\ln [R]_0$
• B

  $[\mathrm{R}]_0$
• C

  $\mathrm{k} \times 2.303$
• D

  $\frac{\mathrm{k}}{2.303}$

Hence, the correct answer is option: 'A'.