Question
Which of the following cyclopentane derivative is optically inactive ?
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${H_2}O\, \rightleftharpoons \,{H^ + } + O{H^ - }$ at $25\,^oC$ is.....$kJ$

| ${N_2}$ in $cc$ | $6.25$ | $9.50$ | $11.42$ | $13.65$ | $35.05$ |
| Time (minutes) | $10$ | $15$ | $20$ | $25$ | Finally |