Which of the following statement is false ? (a) Optical isomerism cannot be observed in \( \left...

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Which of the following statement is false ?
(a) Optical isomerism cannot be observed in \( \left[M_{a b c d}\right]^{n \pm} \) tetrahedral complexes.
\( P \)
(b) Geometrical isomerism does not exist while optical isomerism exists in complex
W \( \left[\mathrm{Fe}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]^{3-} \).
(c) Both cis-form and trans form is optically inactive in \( \left[\mathrm{PtCl}_{2}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+} \) complex ion.
(d) \( \left[\mathrm{Pt}(\mathrm{en})_{2}\right]^{2+} \) show geometrical isomerism as well as optical isomerism.
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