Which of the following complex is optically inactive? (a) \( \left[\mathrm{Co}(\mathrm{en})_{3}\...

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Which of the following complex is optically inactive?
(a) \( \left[\mathrm{Co}(\mathrm{en})_{3}\right] \mathrm{Cl}_{3} \)
(b) cis - \( \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{3} \mathrm{Cl}_{3}\right] \)
\( P \)
(c) cis \( -\left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right] \mathrm{Cl} \)
(d) cis - \( \left[\mathrm{Co}(\mathrm{en})\left(\mathrm{NH}_{3}\right){ }_{2} \mathrm{Cl}_{2}\right] \mathrm{Cl} \).
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